MP3 socket Built-in two pieces of 12V/1.2AH rechargeable battery with charger & 220V AC switching power supply.(automatic charging management) Wired/Wireless Microphone can be use at the same time Specifications and Technical data 1.Power source: AC220V/50Hz DC±12V (Built-in rechargeable battery12V /1.2AH) 2. Frequency Response: VHF180-278MHz 3.Oscillating Mode: ±0.005% quartz control phase locked 4.Wireless effective range :50 meters 5. Channel: Single wireless channel 6. Peak power: 60W 7. Dimensions(H.W.D): 176*110*296mm