Bluetooth 4.2 (Jieli BT chipset) Frequency range:60Hz-20Khz Operation distance: 10m Output power:2*6W SNR:80db Battery Capacity:3.7v/2000mAh Loudspeaker size: 2*70mm Charging Voltage: DC 5V Charging time:2-3hours Playing time:3-4 hours product size:280*100*102mm Function: Bluetooth/AUX IN/TF/USB/handsfree/TWS/FM