What you need to know about Bluetooth connection? 1.When connecting, the Bluetooth device must be placed near the product, and the effective distance cannot exceed 10 meters. 2.When the connection is abnormally disconnected, please re-plug and unplug the Bluetooth adapter, and the Bluetooth adapter will perform the pairing mode again. 3.When one for two connections, first turn off the paired Bluetooth device, unplug the adapter and plug it in again, after the pairing is complete, turn on the paired Bluetooth device. Technical parameter Product model: JH-D901 Bluetooth input: digital audio signal 1KHZ,0dBFS input Bluetooth output: digital audio signal 1KHZ,level 0dBFS Power supply:5±0.25V Working current: 90dB Total harmonic distortion:<0.1% Audio decoding:SBC Transmission distance:10m Package content: 1×USB Bluetooth 5.0 adapter, 1×instruction