A. The product has an exquisite appearance. It uses a Bluetooth 5.0 chip design, offering relatively strong compatibility and stability. It has a 2-in-1 design of Bluetooth receiver (RX) and Bluetooth transmitter (TX), with a toggle switch for quick switching. B. It is equipped with a high - definition LED digital display, making the working status and Bluetooth mode clearly visible. It has a built - in digital to analog chip and supports six signal interfaces including digital optical fiber, coaxial, AUX, U disk, and TF card. C. The NFC function has been upgraded, allowing the mobile phone to connect with one button. It has a cool breathing light in red/blue color, which is soft and not dazzling. D. It has a built - in 500mAh rechargeable lithium battery, providing a relatively long battery life. It supports USB (U disk) and TF card playback and transmission. It supports a 5 - 8 - meter infrared remote control, making various functions easily accessible. E. It has a built - in high - definition microphone, supporting wireless music listening, hands - free calls, and navigation. The product is simple to connect without any cumbersome driver installation or APP downloading. 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%BER Signal to noise ratio: approximately equal to 90dB Distortion degree: less than or approximately equal to 0.1% Interface Type: Input: 3.5mm AUX + Optical + Coaxial + USB + TF interface Output: 3.5mm AUX + Optical parameters: supports 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 or approximately equal to 10M - 15M (open place) 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 can be 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 lotus line 1 x English Manual 1 x Remote control Only the above package content is included, and other products are not. Note: Light and different displays may cause the color of the item in the picture to be a bit different from the real thing. The measurement error is allowed to be approximately +/- 1 - 3cm.