Audio2000's 6023vh VHF Dual Channel Ultra-slim Wireless Microphone w/ 2 Headset Mic Carrier Frequency Range: VHF Band (170MHz-220MHz) One 1/4" Mixed Output & Two 1/4" Individual Output Service Area: 100ft (30.5M) Battery: 9V Battery (Battery included for test only) Dimensions (W X H X D): 8.3" X 1.0" X 5.6"