BOYA BY-WM4 PRO Dual-Channel Digital Wireless Microphone System
Introduction
Thank you for purchasing the BOYA BY-WM4 PRO system! Designed for videographers on a limited budget and video hobbyists, the BY-WM4 PRO is a new generation 2.4GHz wireless microphone system. It features dual channels for capturing audio with dual subjects and is compatible with smartphones, tablets, DSLR cameras, consumer camcorders, PCs, and more. The system is suitable for a wide range of wireless applications such as interviews, mobile journalism, reporting, vlogging, podcasts, and more. The BY-WM4 PRO system is an expandable evolution system that allows users to mix and match different kinds of receivers while using the TX4 Pro transmitter.
Product Kits and Components
The BOYA BY-WM4 PRO system is available in several configurations:
BY-WM4 Pro System (Standard)
Includes one body-pack transmitter (TX4 Pro), one portable receiver (RX4 Pro), and accessories:
- Lavalier/lapel microphone
- 3.5mm to TRS audio output cable
- 3.5mm to TRRS audio output cable
- Cold-shoe mount
- Wind screen
- Microphone Holder clip
BY-WM4 Pro-K2 System
Includes two body-pack transmitters (TX4 Pro), one portable receiver (RX4 Pro), and accessories:
- x2 Lavalier/lapel microphones
- 3.5mm to TRS audio output cable
- 3.5mm to TRRS audio output cable
- Cold-shoe mount
- x2 Wind screens
- x2 Microphone Holder clips
BY-WM4 Pro-K3 System
Designed for Lightning iOS Devices. Includes one body-pack transmitter (TX4 Pro), wireless receiver with a Lightning connector (BY-WM4 RXD), and accessories:
- Transmitter (TX4 Pro)
- Receiver (BY-WM4 RXD)
- Lavalier/lapel microphone
- Wind screen
- Microphone Holder clip
- Pairing Pin
BY-WM4 Pro-K5 System
Designed for Android and other Type-C devices. Includes one body-pack transmitter (TX4 Pro), wireless receiver with a USB Type-C connector (BY-WM4 RXU), and accessories:
- Transmitter (TX4 Pro)
- Receiver (BY-WM4 RXU)
- Lavalier/lapel microphone
- Wind screen
- Microphone Holder clip
- Pairing Pin
Transmitter (TX4 Pro) Components
The TX4 Pro transmitter features:
- 1. Microphone input: Connect the supplied lavalier microphone here. Ensure the 3.5mm plug is fully inserted and clicks into place.
- 2. Line In
- 3. Power LED: Flashes blue when the unit is on. Glows red when power is low.
- 4. Power OFF/ON: Switch to turn the unit on or off.
- 5. Pair Button: Used for connecting signals. Refer to "How to connect transmitter and receiver" for details.
- 6. Antenna: Built-in internal antenna. Avoid touching during use as it may affect signal.
- 7. Battery compartment: Accommodates two AAA batteries.
- 8. Clip: For mounting the transmitter.
Receiver (RX4 Pro) Components
The RX4 Pro receiver features:
- 1. Earphone Jack: A 3.5mm diameter stereo mini jack ? to monitor receiver output by connecting headphones. Note: Do not connect headphones with a monaural mini jack to avoid short-circuiting and distorted sound.
- 2. LINE OUT (audio output) Jack:
- For cameras, camcorders, audio recorders, and other audio/video recording devices: Connect one end of the supplied TRS stereo 3.5mm mini output cable here, and the other end to the device's audio input.
- For smartphones, tablets, or Macs with a combo headphone/Mic jack: Connect one end (90° plug) of the supplied TRRS stereo 3.5mm mini output cable here, and the other end (straight plug) to the device's audio jack.
- 3. Power LED: Refer to the LED indicator table for status.
- 4. Power OFF/ON: Switch to turn the unit on or off.
- 5. Volume +/-: Buttons ➕➖ to set the attenuation level of the input signal.
- 6. Antenna: Built-in internal antenna. Avoid touching during use as it may affect signal.
- 7. Battery compartment: Accommodates two AAA batteries.
- 8. Clip: For mounting the receiver.
- 9. Shoe mount adapter: For mounting the receiver onto a camera's hot/cold shoe ?.
Connector Types: TRRS vs. TRS
Understanding the difference between TRRS and TRS connectors is crucial for proper connection:
- 3.5 mm TRRS connector: Used for Smartphones, tablets, Macs, or laptops with a combo headphone/Mic jack. Connects to the receiver's "LINE OUT" jack.
- 3.5 mm TRS connector: Used for cameras, camcorders, audio recorders, and other audio/video recording devices. Connects to the receiver's "LINE OUT" jack.
Visual Description: The diagram shows a TRRS connector with 4 segments (tip, ring, ring, sleeve) and a TRS connector with 3 segments (tip, ring, sleeve). The text indicates which cable to use for which device.
Setup Guide: Connecting and Pairing
Installing Batteries
- Both transmitter and receiver require two AAA size batteries.
- Slide and remove the battery compartment cover on the transmitter.
- Insert two AAA batteries.
- Close the battery compartment cover.
- Repeat steps 2-4 for the receiver.
Connecting to Devices
Using with Smartphones, Tablets, Macs, or Laptops:
- Mount the receiver to your smartphone, tablet, Mac, or laptop.
- Using the 3.5mm TRRS cable, plug the straight plug into your device's audio jack.
- Insert the 90° plug of the connecting cable into the receiver's "LINE OUT" jack.
- Connect headphones ? to the receiver's headphone jack for monitoring sound, if needed.
- Slide the power ON/OFF switch ▶️ to the ON position. The LED indicator should light up blue.
Note: Some Android devices may require a third-party app to use an external microphone for video recording.
Using with Cameras, Camcorders, or Audio Recorders:
- Mount the receiver to your camera, camcorder, or audio recording device.
- Using the 3.5mm TRS cable, plug one end into the device's audio jack.
- Insert the other end of the connecting cable into the receiver's "LINE OUT" jack.
- Connect headphones ? to the receiver's headphone jack for monitoring sound, if needed.
- Slide the power ON/OFF switch ▶️ to the ON position. The LED indicator should light up blue.
Pairing Transmitters and Receivers
Before leaving the factory, transmitters and receivers are pre-paired. If they become disconnected, follow these steps:
- Turn on the transmitter and the receiver.
- For the receiver, long press the "Pair" button (using a pairing pin if necessary) for 3 seconds. The receiver's indicator will flash quickly, entering pairing mode.
- For the transmitter, long press the "Pair" button on its side for 3 seconds, entering pairing mode.
- When the transmitter and receiver connect successfully, the receiver's light will stay blue, and the transmitter's light will flash every 2.5 seconds.
- If there are multiple transmitters, repeat steps 2-4 for each additional transmitter.
Note: If the units do not connect, their lights will flash continually every 1 second. Try the pairing steps again.
Installing or Uninstalling Clip
The clip ? is mounted on the microphone before leaving the factory. Both transmitter and receiver include a clip, allowing flexible mounting. Adjust the microphone's direction towards your mouth by rotating it.
Mounting Receiver to Camera Hot/Cold Shoe
- Push the receiver's clip ? to the right side.
- Slide the cold shoe mount ? onto the desired position.
- Mount the receiver onto the camera's hot/cold shoe.
Receiver (BY-WM4 RXD) for iOS Devices
The BY-WM4 RXD is a wireless receiver designed for iOS devices with a Lightning connector ⚡.
- 1. Headphone Jack: A 3.5mm diameter stereo mini jack ? for monitoring receiver output. Note: Do not connect headphones with a monaural mini jack.
- 2. Power LED: Indicates status (refer to LED indicator table).
- 3. Lightning Connector: Connects directly to the iOS device's Lightning port ⚡.
- 4. Volume +/-: Buttons ➕➖ to adjust the input signal attenuation level.
- 5. Pair Button: Used for pairing.
- 6. M/S Switch
- 7. Built-In Internal Antenna ?
Setup Guide for BY-WM4 RXD
- Plug the BY-WM4 RXD directly into the Lightning port ⚡ of your smartphone.
- Open your audio/video app on the mobile device. The receiver's indicator should light up.
- The Power LED will flash slowly, waiting for connection with the transmitter.
Note: Please adjust the monitoring audio volume of the RXD before recording.
Connecting Transmitter and Receiver (RXD)
Follow the general pairing steps described earlier if disconnection occurs.
Receiver (BY-WM4 RXU) for Android and Type-C Devices
The BY-WM4 RXU is a wireless receiver designed for Android and other Type-C devices ?.
- 1. Headphone Jack: A 3.5mm diameter stereo mini jack ? for monitoring receiver output. Note: Do not connect headphones with a monaural mini jack.
- 2. Power LED: Indicates status (refer to LED indicator table).
- 3. USB Type-C Connector: Connects directly to the device's USB Type-C port ?.
- 4. Volume +/-: Buttons ➕➖ to adjust the input signal attenuation level.
- 5. Pair Button: Used for pairing.
- 6. M/S Switch
- 7. Built-In Internal Antenna ?
Setup Guide for BY-WM4 RXU
- Plug the BY-WM4 RXU directly into the USB Type-C port ? of your smartphone or device.
- The Power LED will flash slowly, waiting for connection with the transmitter.
Note: Please adjust the monitoring audio volume of the RXU before recording.
Connecting Transmitter and Receiver (RXU)
Follow the general pairing steps described earlier if disconnection occurs.
LED Indicator Status
The Power LED on both the receiver and transmitter indicates operational status:
| Status | Receiver | Transmitter | Description |
|---|---|---|---|
| Connected | Stays blue | Flashes every 2.5 seconds | The transmitter and the receiver are connected. |
| Disconnected | Flashes continually every 1 second | Flashes continually every 1 second | The transmitter and the receiver are disconnected. |
| Receiver OFF | Off | Flashes in blue | Receiver unit is turned OFF (Transmitter is still ON). |
| Transmitter OFF | Flashes in blue | Off | Transmitter unit is turned OFF (Receiver is still ON). |
| Low Power | Flashes in red | Flashes in blue | Low power indicator. |
| Waiting for Pairing | Flashes quickly in blue light | Flashes in blue | The transmitter and the receiver wait for pairing. |
Troubleshooting
If you encounter issues with your BY-WM4 Pro components, consult this checklist. If problems persist, contact your local dealer or BOYA customer support.
| Status / Problem | Cause | Measure |
|---|---|---|
| The units do not turn on. | The batteries of BY-WM4 PRO TX are exhausted. | Replace the batteries with new ones. |
| The Power LED of BY-WM4 RXD doesn't light up while connecting with iOS devices. | Open the audio/video app on the mobile device; the receiver's indicator should light up. | Open the audio/video app on the mobile device; the receiver's indicator should light up. |
| The batteries become drained quickly. | The BY-WM4 Pro components are being used under extremely cold or hot conditions. | The batteries drain quickly under extremely cold or hot conditions. |
| There is no sound. | The transmitter and receiver are not in pairing mode. | Please refer to the "Connecting the transmitter and the Receiver" section. |
| There is no sound. | There is no good connection with the lavalier microphone. | Please try to reconnect the lavalier microphone. |
| There is no sound. | There is no good connection with the earphone. | Please try to reconnect the earphone. |
| The sound is weak. | The input level of the receiver is low. | Adjust the audio output level on the transmitter. Keep this level as high as possible without distortion for the best Sound and Noise Ratio. |
| The sound is weak. | The input level of the receiver is inappropriate. | Adjust the audio output level on the transmitter. Keep this level as high as possible without distortion for the best Sound and Noise Ratio. |
| There is distortion in the sound. | Headphones with a monaural mini jack are used. | Use headphones with a stereo mini jack ?. |
| Too much ambience is being picked up. | When using an omnidirectional microphone, it may pick up too much ambient sound. | Make sure the microphone is as close to the subject as possible. |
| The audio is noisy or distorted (e.g., dropouts, white noise, bursts, pops, clicks). | RF interference or weak RF signal. |
|
Features
- Ideal for YouTube, vlogging, Facebook, podcasts, mobile journalism, and more.
- Digital 2.4 GHz frequency band.
- Dual-channel wireless receiver.
- Ultracompact and miniature-size receiver.
- Super-clear recording sound.
- Up to 60m (197ft) operation range (without obstacles).
- Monitoring sound via 3.5mm headphone output ?.
- Master volume control.
- Selectable stereo and mono mode (For BY-WM4 RXD/RXU only).
- Omnidirectional lavalier microphone.
- Standard camera shoe mount ? and clip ? included (For BY-WM4 PRO/BY-WM4 PRO-K2 only).
- Hard case included.
- Compatible with smartphones, DSLR cameras, consumer camcorders, PCs etc. (For BY-WM4 PRO/BY-WM4 PRO-K2 only).
- Compatible with smartphones, tablets, laptops (For BY-WM4 PRO-K3/K5 only).
Specifications
| Parameter | Specification |
|---|---|
| RF Modulation | GFSK (Gauss frequency Shift Keying) |
| Frequency band | 2.4 GHz (2406-2474MHz) |
| Frequency response | 35Hz-14KHz±3dB |
| Signal/Noise | 84dB or more |
| Distortion | 0.05% or less (32Ω, 1 KHz, 65mW output) |
| RF output level | 3mW |
| Earphone output level | 32Ω, 65mW |
| Reception sensitivity | -90dB +/- 3dB / 0dB=1V/Pa, 1kHz |
| Audio input connector | 3.5mm mini jack |
| Operation range | 60m (197ft) (without obstacle) |
| Power requirements | TX4 Pro/RX4 Pro: 3V DC (Two AAA size batteries) BY-WM4 RXD: Supplied by iOS device BY-WM4 RXU: Supplied by USB Type-C device |
| Plug | BY-WM4 RXD: Apple MFi Certified Lightning Connector ⚡ BY-WM4 RXU: USB Type-C Connector ? |
| Consumption power | Receiver: 3V/70mA; Transmitter: 3V/70mA |
| Dimensions | TX4 Pro/RX4 Pro: 45x70x35mm (1.8x2.8x1.4") BY-WM4 RXD: 82×30.7×12mm (3.2×1.2×0.5") BY-WM4 RXU: 82×30.7×12mm (3.2×1.2×0.5") |
| Weight | TX4 Pro/RX4 Pro: 47g (1.7 oz) BY-WM4 RXD: 12g (0.4oz) BY-WM4 RXU: 9.5g (0.3oz) |
Safety, Caution, and Compliance
Caution
- Please use the original audio signal cable provided for better compatibility and sound quality.
- Operating range figures are approximate and depend on environmental factors like obstructions (metal objects, people) and signal strength.
- Battery life may vary depending on the type of battery used.
Important Notes
- If the wireless microphone will not be used for an extended period, remove the batteries from both the transmitter and receiver.
- Avoid touching the lavalier/lapel microphone, transmitter, or receiver during recording to prevent unwanted noise.
- Keep the transmitter away from high-voltage equipment or strong electromagnetic fields to prevent noise interference.
- Do not use or store the transmitter and receiver in hot or humid environments.
- Do not leave the receiver attached to the camera when storing the camera in a case.
- Ensure correct transmitter and receiver pairing; do not mix them up.
Warning
- Keep the wireless microphone out of the reach of children.
- Never use leaking batteries and never expose batteries to excessive heat or fire.
Maintenance
- Do not operate the device with wet hands or feet.
- Clean the equipment only as described in the instructions.
- Take care to prevent the equipment from dropping. Ensure it is properly fastened and reliably mounted. If dropped, have it inspected by a qualified technician before reuse.
- If the equipment is damaged, defective, or emits a scorching smell: immediately remove batteries to cut power. Do not operate with a damaged housing or attempt self-repair. Have it repaired by a qualified technician.
- Always keep the device in good condition as specified in these instructions.
- Do not open the device.
FCC Statement
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. If this equipment causes harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna; Increase the separation between the equipment and receiver; Connect the equipment into an outlet on a circuit different from that to which the receiver is connected; Consult the dealer or an experienced radio/TV technician for help.
Radiation Exposure Statement
The device has been evaluated to meet general RF exposure requirements. The device can be used in portable exposure conditions without restriction.
ISED Statement (Canada)
English: This device complies with Industry Canada license-exempt RSS standard(s). Operation is subject to the following two conditions: (1) This device may not cause interference, and (2) This device must accept any interference, including interference that may cause undesired operation of the device. The digital apparatus complies with Canadian CAN ICES-3 (B)/NMB-3(B).
French: Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est autorisée aux deux conditions suivantes: (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement.
This radio transmitter has been approved by Industry Canada to operate with the antenna types listed with the maximum permissible gain indicated. Antenna types not included in this list, having a gain greater than the maximum gain indicated for that type, are strictly prohibited for use with this device.
Contact Information
SHENZHEN JIAYZ PHOTO INDUSTRIAL., LTD.
The BOYA logo is a trademark registered and owned by Shenzhen Jiayz Photo Industrial., Ltd.
COPYRIGHT 2010-2020
TEL: 400 6131096
Email: sales@boya-mic.com
Website: www.boya-mic.com / www.jiayz.com
