ROCKFORD URM-73 Rechargeable Wireless Microphone PRODUCT FEATURES: High Power Sounds 2 Channels Wireless Signal-Sturdy TECHNICAL SPECIFICATIONS: Selectable Frequency: 40/CHANNEL Operating Range: 50M Frequency Range: 650-690 MHz Battery: 18650/1500 mAh Operating Voltage: 100-220V Handset Color: BLACK WHAT'S IN THE BOX: 2X Wireless Microphone 1X Wireless Receiver 2X USB Cable 2X Battery 2X Anti-roll Rubber Ring Safety Sheet