ROCKFORD URM-78 Wireless Rechargeable Microphone Product Details: Selectable Frequency: 40/Channel Operating Range: 50m Frequency Range: 650-690 MHz Battery: 18650/1500 mAh Operating Voltage: 100-220V Handset Color: Adonized Gray What's in the box: 2 X Wireless Microphone 1 X Wireless Receiver 2 X USB Cable 2 X Battery 2 X Anti-roll Rubber Ring Safety Sheet