1. The appearance of the product is exquisite; The latest Bluetooth 5.2 technology 2. Adopt the latest high-end Bluetooth chip design; With A and B buttons, the connected devices can be controlled independently 3. With a separate audio light to identify the audio transmission mode; Support RX, TX dual connection function 4. -C charging port, more convenient to use; 3.5MM audio input/output interface, strong versatility 5. Built-in rechargeable battery, long battery life; The product connection is simple, without any cumbersome driving and downloading APP Bluetooth version: Bluetooth V5.2 Device chipset: QCC3040 Support protocol: RX:A2DP AVRCP TX:A2DP Operating frequency band: 2.402GHz -2.480GHz Power level: (Class II) Signal to noise ratio: ≥ 99.3db Distortion: ≤ 0.1% Support dual stream (TX mode) Support multipoint (Rx mode) Operating current: Less than 22mA Built in battery: 250mah Charging current: About 200mA Charging time: about 2 hours Battery life: RX 20H, TX 12H Bluetooth distance: 10m (open place) Charging mode: USB TYPE-C 5V/0.5A Input / output connection mode: 3.5mm audio interface Compatible: Plug and play, no need to drive or download APP. CODEC TX MODE: Adaptive/ HD/ LL// TV/computer/set-top box to two bluetooth devices speaker/headphones CODEC RX MODE: Adaptive/ HD//AAC/ Mobile phone/tablet/computer (two devices can be connected at the same time) - ordinary speaker/amplifier color:Black Material:ABS Package Contents: 2 x Wireless Audio Adapter 2 x English manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.