Supports one send and two receive, and can connect to two Bluetooth playback devices at the same time.Adopts Bluetooth 5.3 chip design, which has stronger compatibility and stability. Equipped with a high-definition LED digital display, the full-screen display of the working status and Bluetooth mode is clearly visible.Built-in digital signal to analog chip, supports digital optical fiber, coaxial, AUX, RCA interface. Upgraded wireless NFC sensing function, one-touch connection/disconnection of the mobile phone.Cool RGB fantasy lights, multi-color adjustable, soft and not dazzling. Support USB (U disk) playback and transmission, support multiple lossless format audio file playback.Built-in high-definition microphone, supports wireless listening, hands-free calls, and navigation. The product is easy to connect, without any driver or APP downloading; Product model: M13 Pro Bluetooth version: V5.3 Supported protocol: RX: A2DP AVRC TX: A2DP Working frequency band: 2.402GHz -2.480GHz Sensitivity: -85dBmLess than 0.1%BER Signal-to-noise ratio: greater than equal 90dB Distortion: less than equal 0.1% Interface type: Input: 3.5mm AUX+RCA+Optical+Coaxial+USB Output: 3.5mm AUX+RCA Optical fiber parameters: Supports optical fiber input, sampling rate supports 32/44.1/48/96/192KHz, 24bit Supported formats: MP3/WAV/WMA/APE/FLAC/M4A/ALAC/AMR Screen size: 25x10mm LED Working current: Less than 40mA Built-in battery: 3.7V/1000mAh (3.7W) Charging current: about 1000mA Charging time: about 1.5 hours Battery life: RX about 10H, TX about 10-12H Bluetooth distance: 10-20M (under barrier-free conditions) Charging method: Type-C 5V/1000mA Compatible devices: for Android, FORIOS system mobile phones and PADs, active speakers, amplifiers, and Bluetooth speakers or head