Using Bluetooth 5.0 chip design, the compatibility and stability are stronger. Bluetooth receiving (RX) and Bluetooth transmitting (TX) two in one. Equipped with a high-definition LED digital display, the working status and Bluetooth mode are clearly visible. Built-in digital to analog chip, supports AUX, RCA, USB, TF interface. Cool breathing light, red/blue dual-color, soft and not dazzling. Bluetooth version: Bluetooth V5.0 Supported protocols: RX: A2DP AVRC TX: A2DP Working frequency band: 2.402GHz -2.480GHz Power level: Power level 2 (Class II) Sensitivity: -85dBm Less than 0.1%BER Signal-to-noise ratio: 90dB Distortion: 0.1% Interface Type: Input: 3.5mm AUX+RCA+USB+TF Output: 3.5mm AUX+RCA Supported formats: MP3/WAV/WMA/APE/FLAC/G729/M4A/ALAC//DTS/MIDI/G726/MTY Working current: Less than 40mA Built-in battery: 3.7V/400mAh Charging current: about 500mA Charging time: about 1 hour Battery life: RX about 6-8H, TX about 8H Bluetooth distance: 10M (open place) Charging : -USB 5V/0.5A Compatible devices: Android, IOS system mobile phones and PADs, active speakers, power amplifiers, and Bluetooth speakers or headphones that support A2DP/protocol. Product size: 73 x 67 x 30mm Type: Bluetooth Adapter Transmission rate: 1048 (Mbps) Bluetooth standard: 5.0 color:Black Material:ABS Package Contents: 1 x Bluetooth Adapter 1 x AUX Audio Cable 1 x Type-C Charging Cable 1 x Red And White RCA Lotus Cable 1 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.