Main function: Bluetooth, hands free, Aux in, TF Product material: Plastic housing Bluetooth: 2.1+EDR/2.4G Speaker: Double track 6 W Amplifier specifications: 40mm 16pin dual magnetic 4Ω/3W*2 Rated frequency: 2.4 GHz Rated voltage: DC5V Battery: 800 mAh lithium polymer battery Play time: 2-4hour Transmission distance: 10M Product size: 280 x 51 x 44mm Net weight: 345g Signal to noise ratio: over 80 db Speaker interface: Micro USB Color: silver, yellow, green, black