1. The appearance of the product is exquisite. Using Bluetooth 5.0 chip design, stronger compatibility and stability. Bluetooth receiver (RX), Bluetooth transmitter (TX) 2-in-1 design, toggle switch to switch quickly. 2. Equipped with high-definition LED digital display, 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. 3. Upgrade the NFC function, the mobile phone can connect with one button. Cool breathing light, red/blue color, soft and not dazzling. 4. Built-in 500mAh rechargeable lithium battery, long battery life. Support USB (U disk), TF card playback and transmission. Support 5-8 meters infrared remote control, all kinds of functions are readily available. 5. Built-in high-definition microphone, support wireless music listening, hands-free call, navigation. The product connection is simple, without any cumbersome driving and downloading APP Product model: M8 Bluetooth version: Bluetooth V5.0 Support protocol: 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 percent BER Signal to noise ratio: equal 90dB Distortion degree: less than equal 0.1 percent Interface Type: Input: 3.5mm AUXandRCAandOpticalandCoaxialandUSBandTF interface Output: 3.5mm AUXandRCA Optical parameters: support optical input, 16M, sampling rate 96kHz Support format: MP3/WAV/WMA/APE/FLAC/G729/M4A/ALAC//DTS/MIDI/G726/MTY Screen size: 32 x 14.5 x 7 MM Working current: less than 40mA Built-in battery: 3.7V/500mAh 1.85Wh Charging current: about 500mA Charging time: about 1.5 hours Life time: RX about 10H, TX about 8H Bluetooth distance: less than equal 10M-15M (openplace) Charging : Type-C 5V-0.5A Compatible devices: Android, IOS system mobile phones and PAD, active speakers, power amplifiers and Bluetooth speakers or earphones that support A2DP/protocol are connected for use colour:Black Material:ABS size:86 x 65 x 22mm Package Contents: 1 x Bluetooth adapter host 1 x Type-C charging cable 1 x 3.5mm AUX audio cable 1 x Red and white RCA lotus line 1 x Ebglish Manual 1 x Remote control Only the above package content, other products are not included. Note: Light 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.