Designed with Bluetooth 5.1 chip for better compatibility and stability. Bluetooth receive (RX), Bluetooth mit (TX) two in one. Equipped with HD LED digital display, working status and Bluetooth mode are clearly visible. Built-in decoder chip, heavy bass effect, support three gain adjustable. Upgrade NFC function, cell phone induction connected. Bluetooth version: Bluetooth V5.1 Support protocol: A2DP or AVRCP or HFP or Working frequency band: 2.402GHz -2.480GHz Power level: Power level 2 (Class II) Sensitivity: -85dBmLess than 0.1 percent BER Signal-to-noise ratio: ≥90dB Distortion: ≤0.1 percent Interface Type: Input: 3.5mm AUXandandUSBandTF cardand6.5mm microphoneanddigital optical fiberanddigital coaxial Output: 3.5mm AUXand Supported formats: MP3 or WAV or WMA or APE or FLAC or G729 or M4A or ALAC or or DTS or MIDI or G726 or MTY Built-in battery: 3.7V or 1200mAh Charging current: about 1000mA (MAX) Charging time: about 1.5 hours Battery life: RX about 8H, TX about 8H Bluetooth distance: ≤30M (open place) Charging method: Type-C 5V or 1A Compatible equipment: mobile phones and tablet computers, active speakers, power amplifiers, desktop computers, mixers, , karaoke machines, etc. Product size: 98 x 67 x 24.2mm color: Black Material: ABS Package Contents: 1 x Adapter 1 x Infrared Remote Control 1 x Charging Cable 1 x Red And White Lotus Cable 1 x Aux Audio Cable 1 x English Manual Only the above package content, other products are not included. Note: Light reflection 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. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.