Mifa Bluetooth Speaker - F5 (Green) Speaker system: 2.0 channel + bass, Active / passive: Active, Operate mode: Button. Main functions: DSP 3D surround stereo sound effect, Bluetooth, hands-free, Auxiliary etc. Storage type: Max. 32GB micro SD card , Power supply: Built in 1200mAh lithium battery DC5V-500mA USB adapter Loudspeaker: 1.5inch *2+bass radiator, RMS: 6W THD=10%, Frequency Response: 100Hz - 20kHz. Bluetooth version: Bluetooth 3.0+EDR, USB Specification: USB 2.0 compatible with USB 1.1, 1 Year Limited Warranty