Adopt Bluetooth 5.0 chip design, which has stronger compatibility and stability. 2 in1 design of Bluetooth receiving (RX) and Bluetooth transmitting (TX), toggle switch for quick switching. Equipped with a high-definition LED digital display screen, the working status and Bluetooth mode are clearly visible. Built-in digital-to-analog chip, supports six signal interfaces of digital optical fiber, coaxial, AUX, RCA, U disk, and TF card. Upgrade the NFC function, and the mobile phone can be connected with one touch. 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+optical (Optical)+coaxial (Coaxial)+USB+TF interface Output: 3.5mm AUX+RCA Fiber parameters: support fiber input, 16M, sampling rate 96kHz Supported formats: MP3/WAV/WMA/APE/FLAC/G729/M4A/ALAC/AMR/DTS/MIDI/G726/MTY Screen size: 32 x 14.5 x 7MM Working current: Less than 40mA Built-in battery: 3.7V/500mAh 1.85Wh Charging current: about 500mA Charging time: about 1.5 hours Battery life: RX about 10H, TX about 8H Bluetooth distance: ≤10M-15M (open place) Charging method: Type-C 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: 92 x 65 x 20mm Type: NFC Bluetooth Adapter Transmission rate: 100 (Mbps) Bluetooth standard: 5.0 Working frequency: 2.4 (MHz) color:Black Material:PC Package Contents: 1 x Host 1 x Type-C Charging Cable 1 x 3.5mm Audio Cable 1 x Red AndWhite RCA Lotus Wire 1 x IR Remote Control 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