PylePro PDWM4400 Rack Mount 4 Mic VHF Rack Mount Wireless Lavalie/ Headset System Frequency Response: VHF 160-270MHz Power Supply: 110/220 V Specification: Professional VHF Wireless System 4 Belt Pack Transmitters w/ Lavalier and Headset Mics Power On/Standby/Off Switch 4 x 9V Batteries and 1/4 Audio Cable Included RF Indicators AF Level Meters Individual Volume Controls 1/4' Individual and 1/4 & XLR Mixed Output Operation Frequencies (Hz): 177.6 / 201.6 / 238.6 / 262.7 Operation Range: Up to 240 ft. Sold as: Unit Dimension: 1.80H x 16.50W x 8.20D Weight: 8.52 lbs.