Main features: The appearance of the product is exquisite. The Bluetooth 5.0 chip design makes it more compatible and stable. Bluetooth receiving (Rx), Bluetooth transmitting (TX), FM transmitting three in one design. Equipped with high-definition LED digital display screen, the working status and Bluetooth mode can be clearly seen. Built in digital to analog chip, supporting digital optical fiber, coaxial, aux, RCA interface. Upgrade NFC function and connect the mobile phone at one touch. Cool breathing lamp, red / blue, soft and not dazzling. Built in 500mah rechargeable lithium battery, long life Support USB (U disk), TF card playing and transmitting. Support FM transmission, and the frequency can be adjusted from 87.5 to 108. Support 5-8m infrared remote control, all kinds of functions. Built in high-definition microphone, supporting wireless listening, hands-free call and navigation. The product connection is simple, without any tedious driving and downloading app; Product parameters: Product model: M6 Bluetooth version: Bluetooth v5.0 Support protocol: Rx: A2DP avrc TX: A2DP Operating frequency band: 2.402ghz-2.480ghz Power level: power level 2 (class II) Sensitivity: - 85dBm < 0.1% BER SNR: 90dB Distortion: 0.1% Screen size: 36 * 8mm Working current: < 40mA Built in battery: 3.7v/500mah Charging current: about 400mA Charging time: about 2 hours Endurance: RX about 10h, TX about 8h Bluetooth distance: 10m (open space) Charging mode: Micro USB 5V / 0.5A packing list: Bluetooth adapter host x1 Micro USB charging cable x1 3.5mm audio cable x1 Red and white RCA lotus line x1 Manual x1 (Chinese/English optional) Packing box x1 (Chinese/English optional) Note: Optical fiber cable and coaxial cable are optional accessories