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. 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 APPProduct model: M8Bluetooth version: Bluetooth V5.0Support protocol: RX: A2DP AVRC TX: A2DPWorking frequency band: 2.402GHz -2.480GHz level: level 2 (Class II)Sensitivity: -85dBm less than 0.1%BERSignal to noise ratio: greater than equal 90dBDistortion degree: less than equal 0.1%Interface Type:Input: 3.5mm AUX+RCA+Optical+Coaxial+USB+TF interfaceOutput: 3.5mm AUX+RCAOptical parameters: support optical input, 16M, sampling rate 96kHzSupport format: MP3/WAV/WMA/APE/FLAC/G729/M4A/ALAC/AMR/DTS/MIDI/G726/MTYScreen size: 32 x 14.5 x 7 MMWorking current: less than 40mABuilt-in battery: 3.7V/500mAh 1.85WhCharging current: about 500mACharging time: about 1.5 hoursLife time: RX about 10H, TX about 8HBluetooth distance: less than equal 10M-15M (openplace)Charging : Type-C 5V-0.5ACompatible devices: , IOS system mobile phones and PAD, active speakers, amplifiers and Bluetooth speakers or earphones that support A2DP/protocol are connected for usecolour:BlackMaterial:ABSsize:86 x 65 x 22mmPackage Contents:1 x Bluetooth adapter host1 x Type-C charging cable1 x 3.5mm AUX audio cable1 x Red and white RCA lotus line1 x Ebglish Manual1 x Remote controlOnly 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.