Signal to noise ratio: 90 dB Bluetooth version: V5.4 Frequency range: 2.402GHz -2.480GHz Frequency response: 10Hz -20KHz Battery capacity: 3.7V 400mAh (1.48Wh) Interface type: AUX/USB Peripheral support: AUX/USB Input parameters: DC 5V=1A (1000mA max) Transmission distance: Accessible, about 10-20 meters Music format: MP3/WAV/WMA/FLAC/APE/M4A/ALAC Bluetooth protocol: HFP 1 A2DP/AVRCP USB drive support: FAT12/FAT16/FAT32/exFAT format Power supply method: Type - C charging Supporting devices: mobile phones/tablets/computers/televisions/speakers/ amplifiers/projectors/mixers, etc Color: Black Material: ABS+PC Package Contents: 1 x Bluetooth adapter 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.