Power Output (Handling Capacity): 10W x 2. Speaker Unit: 5.08 cm (2 inch). Impedance: 3Ω. BT Version: 4. BT Range: 7 to 10 meters. Distortion: < 1 percent. SNR: > 85dB. Frequency Response: 180Hz-16KHz. FM Frequency Receiver: 88MHz to 108MHz. Power Supply: DC 5V/1A. Battery Capacity: 3.7V/4000mAh (In-built). Battery Type: Lithium-ion rechargeable battery. Input: USB/FM/BT/AUX. Calling Available: Yes (Wireless). Digital FM Playability: Yes. Digital Controls: Power, Vol+, Vol-, play or pause, calling. Indicator LED: Yes (charging or discharging or power). Charging Interface: Micro USB. USP: Battery saving (set gets auto off after 15 minutes, if any input device not connected).