BLUETOOTH SPEAKER MANUAL FEATURES: True wireless stereo function Support USB/TF card FM Radio AUX-in function Karaoke Function Rechargeable Lithium battery SPECIFICATION: Output power 20W Driver unit size 6.5 inch Impedance 3 Ohm S/N ratio 280dB Separation 245dB Distortion =1.0% Frequency response 100Hz-20KHz Bluetooth version Bluetooth range 10 meters Bluetooth pairing name BT SPEAKER Bluetooth profiles supported AVDP USB & TF max.