LE501 USB Bluetooth 5.3 Wireless Audio Transmitter 1. Bluetooth version: Bluetooth V5.3 2. Supported protocols: A2DP, AVRCP, AFH, HFP, HSP 3. Working frequency band: 2.402-2.480GHz 4. Power class: Class II 5. Input interface: USB (driver-free), AUX audio 6. Power supply mode: USB 5V power supply 5. Support dual stream (TX mode): The transmitter supports connecting two Bluetooth speakers or headphones at the same time (using the same CODEC), and the dual connection can support aptX Adaptive 6. Codec mode: aptX AdaptiveaptX HDaptX LLaptXSBC 7. Note for APTX use: aptX Adaptive CODEC is preferentially supported in single connection (the connected device must also support aptX Adaptive) 8. Bluetooth distance: greater than 10m (without obstruction and interference) 9. Indicator light: 2 indicator lights. The blue light flashes quickly, the first device is searched and paired; the blue light is always on, the Bluetooth device is successfully connected; the green light flashes quickly, the second device is searched and paired; the green light is always on, the two Bluetooth devices are successfully connected 10. Button: click to connect back, double-click to quickly enter the pairing state 11. Compatible with: common computer systems, such as: Windows XP7810, Linuxps4NSAndroid 12. OnOff: Automatically turn on after connecting the power adapter or computer USB power supply, and automatically turn off after unplugging Packing list: USB transmitter x 1 Manual x 1 3.5mm audio cable x 1