WJ21 Guitar Wireless System

Thank you for choosing our guitar wireless system. This product is designed specifically for guitar wireless connectivity, which features low noise, low latency, high sound quality sampling rate (48KHz) and long effective transmission distance. It is suitable for electric guitar, bass, violin, keyboard piano and other instruments. Please read this user manual carefully before using the product to ensure correct, safe usage and keep it in good condition.

I. Safety Notes

1. Power Supply

• The wireless device is powered by lithium battery. A specialized 2-in-1 charging cable is provided. Ensure the device is powered off during charging to avoid power loss, resulting in longer charging time and shorter battery life.
• Turn off the wireless device when not in use, otherwise the battery will continue to drain.

2. Connection

• Before connecting or disconnecting the wireless device from the Guitar amplifier and other equipment, ensure that the power supply and other relevant equipment are turned off. This will help to avoid equipment failure and damage to other equipment.

3. Interference

• This device operates in the 2.4GHz frequency band, successfully avoiding interference caused by TV stations, public broadcasting, cell towers, and other high-power signal sources. However, it is still recommended to use it away from routers or other wireless system devices.

4. Warning

• To reduce the risk of electric shock or fire, do not use this device in rainy or humid environments.

II. Product Specifications

• Sampling rate: 24bit/48KHz uncompressed data transmission
• Latency: <12ms
• Effective range: 20 meters (in open space)
• Degree of distortion: <0.05% (1 KHz-10dBFS)
• Dynamic range: >105dB
• Operating frequency band: 2.4GHZ ISM frequency band
• Frequency response: 20-20KHz
• Battery capacity: Transmitter 780mAh, Receiver 450mAh
• Charging cable: 2 in 1 Type-C
• Charging time: about 2 hours
• 280° rotatable connector, suitable for most musical instruments

III. Product Introduction

1. Transmitter

The transmitter unit has the following components:

• 1. Signal-input Plug: It can be plugged into the instrument's output.
• 2. 280° Rotatable Connector: Allows for flexible positioning.
• 3. Type-C Charging Port: For charging the device.
• 4. Connection Status Indicator Light:
  • Flashing slowly in green: Idle state, not yet paired.
  • Flashing quickly in green: Pairing state.
  • Solid green light: Working state, paired successfully.
• 5. Pairing Button: Long press for 3 seconds to enter pairing state.
• 6. Power Button: Turns the device on or off.
• 7. Battery Indicator Light:
  • One light on: 20% battery level (low battery state).
  • Two lights on: 50% battery level.
  • Three lights on: 75% battery level.
  • Four lights on: 100% battery level.
  • Lights go out: Battery is flat, device is in power-off state.
  • Four lights flashing in sequence: Device is being charged.
  • Four lights solid: Device is fully charged.

2. Receiver

The receiver unit has the following components:

• 1. Signal-output Plug: Connects to the loudspeaker box or effector.
• 2. 280° Rotatable Connector: Allows for flexible positioning.
• 3. Type-C Charging Port: For charging the device.
• 4. Connection Status Indicator Light: (Same as Transmitter)
  • Flashing slowly in green: Idle state, not yet paired.
  • Flashing quickly in green: Pairing state.
  • Solid green light: Working state, paired successfully.
• 5. Pairing Button: Long press for 3 seconds to enter pairing state.
• 6. Power Button: Turns the device on or off.
• 7. Battery Indicator Light: (Same as Transmitter)
  • One light on: 20% battery level (low battery state).
  • Two lights on: 50% battery level.
  • Three lights on: 75% battery level.
  • Four lights on: 100% battery level.
  • Lights go out: Battery is flat, device is in power-off state.
  • Four lights flashing in sequence: Device is being charged.
  • Four lights solid: Device is fully charged.

IV. Usage and Operation

1. Usage Instruction

1. Turn on the receiver and transmitter separately and wait for the devices to start up normally. The indicator lights of both devices will flash slowly in green.
2. Long press the pairing button of the receiver for about 3 seconds. The indicator light will flash quickly in green, and the receiver enters pairing state.
3. Long press the pairing button of the transmitter for about 3 seconds. The indicator light will flash quickly in green, and the transmitter enters pairing state.
4. After waiting for 1 second, the receiver and transmitter will connect automatically. After successful connection, the connection status indicator lights of both devices will be solid green.
5. Connect the transmitter to the instrument and the receiver to the loudspeaker box, then start to use.

NOTE: After the transmitter and receiver are successfully paired once, they will be automatically paired upon turning on in future use.

2. Expanding Function

• This product can support 6 pairs of wireless systems to be used simultaneously in the same environment without interference.
• The wireless system can support one transmitter to send signals to six receivers (of the same product model).

V. Common Problems

1. The device cannot be turned on.

The device has not been used for a long time, or it was powered off due to low battery and not charged in time. Low battery can cause the battery to enter protection mode, requiring charging to activate it.

2. The device can be turned on, but it does not work and there is no sound.

Please check if the connection is successful. If the connection is successful, the transmitter and receiver connection status indicators will always be green. Please check if the loudspeaker box connection plug or speaker is normal.

3. There is strange noise or intermittent sound during use.

There may be strong electromagnetic interference, too long transmission distance, or too many transmission obstacles, causing communication data loss. Please try to shorten the transmission distance or move away from obstacles.

4. The device cannot be charged normally.

Please use a 5V charger to charge. The lithium battery may enter a protection state if it remains in a low battery state for a long time, requiring a few minutes of charging to start. The charger may be abnormal; please try another charger.

5. Whether multiple receivers can simultaneously receive signals from one transmitter.

This requires that the transmitter and receiver have the same product model. When pairing, let all receivers enter the pairing state first, then let the transmitter enter the pairing state. Start to use after successful pairing.

FCC Warning Statement

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.

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.

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