Transmission range: 10-20 meters (barrier-free) Interface: 3.5mm AUX//USB/Type-C Input parameters: DC 5V-1000mA (MAX) Supported protocols: /AAC//HD/LL/AD USB supported protocols: WMA, MP3, WAV, FLAC, APE, M4A, ALAC, Product name: Wireless audio receiver/transmitter Product model: M10 Pro+ Bluetooth protocol: 3040 Bluetooth version: Bluetooth V5.2 Battery: 3.7V/400mAh (UN38.3) Charging time: about 1.5 hours Usage time: about 6 hours of listening to music, 30 days of standby Usage: Driver-free Product material: High-strength fireproof V0 PC (70%)+ABS (30%) Basic functions: Bluetooth reception, Bluetooth transmission, USB playback (up to 128G), RGB color display Supported devices: various speakers, desktop computers, laptops, , amplifiers, projectors Color:Black Material:Plastic+Metal Package Contents: 1 x Audio Adapter 1 x Audio Cable 1 x AUX Cable 1 x Type-C Charging Cable 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.