Sound Voice channel: 2.2 double channels Power: 5W*2 Impedence: 4Ohm Output: 10W THD=10% Speaker system: 45mm 16 cores inner magnetic speaker+40*70mm radiator Connection Bluetooth version: BT 5.0 Bluetooth frequency: 2.4-2.48GHZ Bluetooth distance: 10 meters Battery Build in 2200mAh Li-battery Power supply : DC5V-1000mAh Charge time: 2.5 hours Music play time: 10 hours at medium volume 3 hours at maximum volume Storage type: up to 32GB micro SD card/USB disk File format:MP3 WMA WAV APE FLAC