Loud buzzing noise (Ground loop). Solution: This is common in cars. Use a "Ground Loop Isolator" (cheap filter from Amazon) between the BT 5908 and the AUX cable. 7. Frequently Asked Questions (FAQ) Q: Is the Jie Rui BT 5908 waterproof? A: No. The manual explicitly states "Indoor / Dry location use only." Do not install it in a boat cockpit or motorcycle handlebar without a waterproof case.

A: Yes. The manual confirms "Pass-through charging" works. You can play music while the board is plugged into USB power.

Device powers on, but no sound. Solution: Check the "Mute" button on the IR remote. Also, verify the audio output jumper on the board is set to "DAC" not "Line out."

Bluetooth name "BT-5908" not found. Solution: The unit might be in "FM Radio" mode. Press the "Mode" button on the remote until the LED flashes blue (Bluetooth mode).

Jie Rui (often stylized as JIERUI) is a prominent OEM manufacturer in the automotive and industrial electronics space. The model is widely recognized as a versatile Bluetooth receiver, MP3 decoder board, or car hands-free kit. However, finding the original documentation can feel like a treasure hunt due to the brand's generic packaging.

A: There is no reset button. To factory reset: Turn off the device. Press and hold the "Play/Pause" button while plugging in the power. Hold for 10 seconds. All paired devices will clear.