Wireless Audio Receiver/Transmitter User Manual V1.0

1. Product Overview

This document provides a user manual for the Wireless Audio Receiver/Transmitter, model JYDBT003.

The device features a compact design with a 3.5MM stereo audio input/output port. Key components and indicators include:

• [Audio encoding light]
• [MIC indicator] (in RX mode)
• [Connect device indicator light]
• [RX status light]
• [RX button]
• [TX button]
• [TX status light]
• [Charging interface]
• [Charging indicator light]
• [P/R pairing button]
• [Volume+/Previous Song button]
• [Play/Pause/Call button]
• [Volume-/Next Song button]
• [Power switch]

2. Functional Operation

RX Receiving Mode

In RX Receiving Mode, this device can transmit sound from mobile phones, laptops, PADs, and other devices to Bluetooth-enabled speakers and car audio systems.

Operation Steps:

1. Turn the [Power switch] to the "ON" end to turn on the device. The switch is shown moving from OFF to ON.
2. Click the [RX button]. The [RX light] will turn on, indicating the device has entered RX mode.
3. Double click the [P/R pairing button] (indicated by 'x2'). The [RX light] will flash rapidly (3 times per second), signifying pairing mode.
4. Turn on your phone's Bluetooth. Search for the Bluetooth device named "LE522", select it, and click to connect. The phone screen shows Bluetooth settings with 'LE522' available.
5. After a successful connection, the [RX light] will remain on, and [LED 1] will also light up.
6. Insert the 3.5mm audio cable from the device into the audio input interface of the audio equipment. You can then play music from your phone.

RX Receive One to Two Function

This function allows the device to connect to two mobile phones simultaneously in RX mode.

Operation Steps:

1. Follow the above steps to connect the first mobile phone.
2. After the first mobile phone is successfully connected, double-click the [P/R pairing button] on the device. The [RX button] light will flash rapidly (3 times per second), and the device will enter pairing mode.
3. Open the Bluetooth function of the second mobile phone, search for Bluetooth devices, and select the connection "LE522" from the Bluetooth list. The phone screen shows Bluetooth settings with 'LE522' available.
4. After successful connection, the [RX button] light on the device will remain on, while [LED 1] and [LED 2] will also light up.

RX-FAQ

• 1) Noise issues (interference/current noise, etc.)
  1. Step 1: Ensure both ends of the audio cable are plugged in properly. Improper connection can cause clicking or continuous buzzing sounds.
  2. Step 2: Avoid wrapping the audio connection cable with other cables.
  3. Step 3: If noise occurs during charging, remove the charging cable. The noise may be caused by current interference.
• 2) I don't have the interface I need
  1. Step 1: This product supports audio devices with RCA and AUX 3.5MM audio input interfaces only. If your device has fiber optic or coaxial interfaces, you will need to purchase a corresponding conversion box separately.
• 3) Mobile phone, PAD, PC cannot search for this Bluetooth device
  1. Step 1: Clear and restart the phone, PAD, or PC. Delete other unused Bluetooth device names, then restart and search for pairing.
• 4) Precautions for connecting two mobile phones
  1. Step 1: When two phones are connected simultaneously, pause the music from one device before playing music from the other. Playing music from two mobile phones simultaneously may cause adverse phenomena such as stuttering or no sound.

TX Transmission Mode

This device can be used with TVs and desktop computers without Bluetooth to wirelessly transmit sound to Bluetooth headphones or speakers.

Operation Steps:

1. Turn on the Bluetooth speaker or Bluetooth headset that is waiting to be connected and ensure it is in pairing mode. Note: If it is in a reconnection state or already occupied by another connection, it will not be able to pair with this device. Diagrams show a Bluetooth earbud case, headphones, and a speaker.
2. Turn the [Power switch] to the ON end and turn on the device. The switch is shown moving from OFF to ON.
3. Click the [TX button]. The [TX light] will turn on, indicating the device has entered TX mode.
4. Double click the [P/R pairing button] (indicated by 'x2'). The [TX light] will flash rapidly (3 times per second), and the device will enter pairing mode.
5. After successful connection, the [TX light] on the device stays on, and [LED 1] also lights up.
6. Insert the 3.5mm audio cable from the device into the TV audio output interface.
7. TV Connection & Audio Settings:
   • For 3.5MM AUX/headphone jack connection, change the TV audio settings to "headphones". A diagram shows a TV with an AUX/3.5MM audio output jack, with speaker options: Internal speakers, External speakers, Headset. If there is no sound, ensure the TV speaker is set to "headphones".
   • For RCA R/L audio cable connection, change the audio settings to "external speakers". A diagram shows a TV with RCA R/L audio output jack, with speaker options: Internal speakers, External speakers, Headset. If there is no sound, ensure the TV speaker is set to 'external speaker'.
8. When the device is successfully connected to play music, the [audio encoding light] will light up accordingly.

Note:

• If the connection is not successful for a long time, it is recommended to reset the device and the Bluetooth earphones/speakers to factory settings and reconnect them. Please turn off surrounding Bluetooth devices when connecting to prevent interference.
• If the sound is abnormal (no sound, stuttering, noise) after connecting Bluetooth earphones or speakers, you can double-click the [TX button] to switch audio encoding to SBC.

TX Transmission One to Two Function

This function allows the device to transmit audio to two Bluetooth devices simultaneously in TX mode.

Operation Steps:

1. Refer to the above connection steps to connect to the first Bluetooth earphone or speaker.
2. Turn on the second Bluetooth earphone or speaker and enter pairing mode. Diagrams show a Bluetooth earbud case, headphones, and a speaker.
3. Double click the [P/R pairing button] (indicated by 'x2'). The [TX button] light will flash rapidly (3 times per second), and the device will enter pairing mode.
4. After successful connection, the [TX button] light on the device stays on, while [LED 1] and [LED 2] light up, and the Bluetooth earphones or speakers emit sound.

Note:

• If unable to connect to the second Bluetooth device, check if the device is occupied by another connection. Restore the second device to factory settings, repeat the above steps, and try pairing again. When connecting devices, turn off peripheral Bluetooth devices to avoid misconnection issues.
• If the sound is abnormal (no sound, stuttering, noise) after connecting Bluetooth earphones or speakers, you can double-click the [TX button] to switch audio encoding to SBC.

TX-FAQ

• 1) Noise issues (interference/current noise, etc.)
  1. Step 1: Ensure both ends of the audio cable are properly plugged in. Improper connection can cause a clicking or continuous buzzing sound.
  2. Step 2: Do not wrap the audio cable with other cables, and do not expose the metal head of the audio cable to avoid interference.
  3. Step 3: If noise occurs during charging, remove the charging cable. The noise may be caused by current interference.
• 2) TX mode cannot connect Bluetooth earphones/speakers
  1. Step 1: Wait for the connected Bluetooth earphones or speakers to enter pairing mode before they can be connected and used.
  2. Step 2: The [TX button] light on the device flashes rapidly (3 times per second) to indicate pairing status. You can double-click the [P/R pairing button] on the device to enter this mode.
• 3) Audio delay issue
  1. Step 1: This device features APTX-LL low latency function in TX mode. Paired Bluetooth earphones/speakers must also have APTX-LL function to achieve low latency audio transmission. The [audio encoding light LL] on the device lighting up indicates low latency transmission.
• 4) I don't have the interface I need
  1. Step 1: This product only supports devices with RCA and AUX 3.5MM audio output interfaces. If your device interface is fiber optic or coaxial, you need to purchase a corresponding conversion box separately.

3. Common Operation Instructions

Power on/off/automatic shutdown

Switch the [Power switch] to ON/OFF for power on/off. The device automatically shuts down after 10 minutes if there is no connection or sound transmission.

A diagram shows the power switch in the OFF and ON positions, and a [10 min] indicator.

Low battery alarm prompt

When the device is low on battery, the charging red light flashes. If the battery level is below 3.0V, the device will automatically shut down.

A diagram shows the device with a red light indicating low battery: [The red light flashes when the battery is low].

Key function

(x1 represents single click, x2 represents double click, 1s long press for 1 second, 8s long press for 8 seconds)

RX Mode Operations

TX Mode Operations

4. Charging

The charging red light flashes during product use, indicating the device has low battery and needs to be charged.

A. Insert the Type-C charging cable into the product charging port and connect the other end to a USB 5V power output port (e.g., a phone charger or computer USB interface). A diagram shows the Type-C cable connecting to the device and then to a laptop.

B. The charging time is approximately 2 hours. The red light stays on during charging and turns off after charging is completed. A diagram shows the device charging with a red light.

Note:

• When the battery level is too low or the charging power source quality is poor, it may cause the device to produce current noise.
• During charging, charging backflow noise may occur when the battery is nearly fully charged. Removing the charging cable can resolve this issue.

5. Definition of LED Function

6. Main parameters of the product

• Bluetooth version: V5.4
• Bluetooth protocol support: RX: A2DP AVRCP HSP HFP; TX: A2DP
• Transmission distance: >12M (unobstructed)
• Battery standard: 230mAh
• Working hours: RX>18H, TX>15H
• Charging time: about 2 hours
• Charging voltage: DC 5V
• Audio input/output: 3.5MM stereo sound frequency line
• Audio CODEC: TX, aptX Adaptive/ aptX HD/aptX LL/ aptX/ SBC; RX, aptX Adaptive/ aptX HD/aptX/ AAC/SBC

7. Packaging List

• Bluetooth transceiver x1
• Type-C charging cable x1
• RCA audio adapter x1
• product manual x1
• 3.5MM audio conversion head x1
• Airplane audio adapter x1

FCC Warning 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.

Any 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. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause 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.

FCC RF exposure statement

The device has been evaluated to meet general RF exposure requirement. The device can be used in portable exposure condition without restriction.