MR252 USB HD Bluetooth Transmitter Manual

MR252 USB Bluetooth audio transmitter Bluetooth 5.3, computer TV USB driver-free dual interface supports AUX connection, high-fidelity Bluetooth one for two, with voice function to support calls while playing games. You can convert the USB output or AUX output playback device such as TV or computer into Bluetooth transmitter to connect to Bluetooth speakers, Bluetooth headsets, or Bluetooth power amplifiers and other devices.

Product Specifications:

Product Name: Wireless Audio Transmitter

Bluetooth version: V5.3

Bluetooth chip: QCC3056

Input port: USB/AUX

Transmission distance: > 10 meters

Frequency range: 2.402GHZ-2.480GHZ

Supported protocols: A2DP, AVRCP

Audio encoding: support aptX HD, aptX LL, aptX, Adaptive

Device power supply: USB 5V

One for two: Supports connecting two stereo headphones at the same time.

Interface physical diagram:

1: Bluetooth antenna

2: AUX (3.5mm) input port

3: Bluetooth signal light

4: Bluetooth pairing button

5: APTX LL/HD switch button

6: APTX HD indicator

7: APTX LL indicator

8: SBC indicator

9: APTX indicator

10: USB interface

Key Description:

USB: USB 5V power supply interface, USB audio input interface. (Note: After the USB interface is connected to the PC, music can be transferred through this interface).

Bluetooth pairing button: Double-click the button to enter the pairing state, click the button to connect back to the device.

The LL and HD lights are on at the same time to match the aptX Adaptive code.

APTX LL/HD switch key: click to switch aptx-LL/aptx-HD audio encoding, note: the connected Bluetooth device needs to support aptx-LL/aptx-HD!

Function operation:

1. Turn on the device Connect the transmitter to the USB port of a computer, TV, power adapter, etc., and the device will automatically turn on.

2. Audio input USB audio input: After the transmitter is connected to the USB interface of a computer, Switch base, TV BOX, etc., the audio can be directly transmitted to the transmitter through the USB interface for forwarding. (Note: no need to plug in the audio cable) AUX audio input: Connect the 3.5MM audio cable to the transmitter, you can input the audio from TV, CD, MP3 and other devices to the transmitter through the audio cable for forwarding. (In AUX mode: USB is directly plugged into the power bank/socket USB interface for power supply)

Note: When using the PC side, if the transmitter is used in the USB audio input, and the 3.5MM audio cable is plugged into the AUX port, it will cause no sound output from the transmitter! ! !

3. Bluetooth pairing steps:

1) Turn on the Bluetooth headset and set it to pairing state.

2) Insert the device into the PC host or the USB port of the TV, and the device is turned on; double-click the Bluetooth pairing button, the blue status light flashes rapidly, and the device enters the state of pairing and searching for Bluetooth headsets.

Note: Select the MR252 device output in the PC sound settings.

3) The blue indicator light on the device is always on, and the connection is successful.

4. Duplex call mode (in this mode, you can talk while gaming)

Press and hold the Bluetooth pairing button for 1S to switch to duplex mode (Note: in duplex mode, the pairing blue light flashes slowly and the audio coding light is off)

1) In duplex mode, cannot switch to AUX audio input.

2) In AUX audio input mode, duplex mode cannot be enabled.

3) When entering duplex mode after connecting two bluetooth devices, only the first connected bluetooth headset will work.

4) If you connect a bluetooth headset and a speaker (without call function), after the duplex is turned on, the speaker will have no sound output.

For example, two speakers (both without call function) cannot turn on duplex mode.

5. One-to-two function operation

Refer to the above operation to connect the first Bluetooth device.

Turn on the second bluetooth headset and set it to pairing mode.

Double-click the Bluetooth pairing button on the transmitter, the green status light flashes quickly to search for the second Bluetooth device.

After the connection is successful, the green indicator is always on.

6. Troubleshooting:

When you encounter problems during use, you can try the following solutions:

Transmitter not working properly?

The transmitter cannot be turned on normally, please check whether the USB interface of the transmitter is properly connected and the contact is poor? Please try plugging the transmitter back in.

No sound from the transmitter? When the transmitter is used in the USB audio input, if the 3.5MM audio cable is plugged in, it will cause no sound output from the transmitter.

Is there a delay in the sound when the device is in use? This device supports aptX LL function, please check whether your Bluetooth device has low latency function? Low-latency sound transmission can only be achieved when both the transmitter and the Bluetooth device support the low-latency function.

Search can’t connect to a Bluetooth device (Bluetooth headset or speaker)? Please check if your bluetooth device is in pairing state?

The connection status of the device can be judged according to the LED lights. The blue LED is always on to indicate that one Bluetooth device has been connected, and the green LED is always on to indicate that two Bluetooth devices have been connected.

Searching for a long time and cannot connect to a Bluetooth device? You can restart the transmitter or bluetooth device and try again.

Intermittent sound and stuttering during use? You can restart the transmitter device and try to connect it again, and pay attention to whether the antenna is tightened!

Note: Please do not place the device on metal objects, and do not block them. When the transmitter signal is interfered or blocked, it may also cause the sound to be intermittent/stuttered.