Battery 150MAH/3.7V Lithium rechargeable battery, with charging voltage 5.1V Battery Last Continuous Recording time up to 7 hours after full charging USB Transmission Speed USB 2.0 Maximum 960KBPS Recording Bit Rate 128KBPS Rec Audio Sample Rate 32KHz Frequency Range 20HZí¬20KHZ Output Power 4mW+4mW(16 Q) 1G,2G,4G are available 50pcs/lot,2kg,130mm*100mm*80mm