Mifa Bluetooth Speaker F1 (Blue) Storage type: Max.32GB micro SD card Power supply: Built-in 1100mAh lithium battery DC5V-500mA USB adaptor Loudspeaker: 2inch + Suspended passive radiator. Output power: 4ohm 3W, Frequency Response: 80Hz-18KHz. Bluetooth version: 2.1+EDR, USB specification: USB 2.0 compatible with USB 1.1 File format: APE, FLAC, WAV, WMA, MP3, Product size: W81xD81xH