Wireless microphone System 4 channel 4 bobypack 4 Lapel Mic 4 Headsets 3 year free warranty Features: 4 Channel 4 bobypack 4 Lapel Mic 4 Headsets Individual Volume Control on each Channel One 1/4" Mixed and four XLR" Individual Outputs Perfect operation status indicater 2 Telescoping Receiver Antennas Broad frequency response range, super low distortion Full metal design Use 2*1.5V battery Specifications: Overall System Number of Channels:4 channels Carrier frequency range:500MHz-580MHz Stability:±0.006% Normal deviation:±22kHz S/N ratio:<120dB T.H.D:<0.6% Frequency response:50Hz-15kHz Receiver Sensitivity:>80dB Audio output:Balanced and Unbalanced Power requirement:AC 16V,400mA Dimensions:440×210×40mm Weight(weight):Approx.1.3kg Wireless Microphone Cartridge:Dynamic Antenna:Built-in RF output:<10mW Normal deviation:±22kHz Maximum deviation:±80kHz Battery:1.5V battery Battery life:>8 hours Comes With 4 x Lavalier Microphones 4 Lapel Mic 4 Headsets Base Transmitter US 110-240v Power Adapter 1/4'' Male to 1/4'' Male Phone Jack Lead