Features: UHF Band Receiver System Quad Frequency 4-Channel Design (Channel 1, 2, 3, 4) Broad Frequency Response Range & Low Distortion High Signal/Noise Ratio Performance RF Signal & AF Signal LED Indicators LCD Digital Display with Channel & Frequency Readout Independent Channel Adjustable Volume Controls Easy-to-Use Touch Button Controls Detachable Dual Antennas Rack Mountable System What's in the Box: 4-Ch. Microphone Receiver (2) Handheld Microphones (2) Beltpack Transmitters (2) Headset Microphones (2) Lavalier Microphones (8) x 'AA' Batteries Detachable Rack-Mount Hardware Wall Power Adapter Handheld Microphone Specs: RF Output: 10dBm Modulation Type: FM Max Deviation: ±40KHz Spurious Emission: >55dBc Battery Powered, Requires (2) x ‘AA' Batteries -Each Microphone Dimensions: 9.4'' x 2.0'' x 2.0'' -inches Bodypack Transmitter Specs: RF Output: 10dBm Modulation Type: FM Max Deviation: ±40KHz Spurious Emission: >53dBc Battery Powered, Requires (2) x ‘AA' Batteries -Each Bodypack Dimensions: 4.1'' x 2.6'' x 1.2'' -inches 4-Channel Base Receiver Specs: Image & Spurious Rejection: >70dB Receiving Sensitivity: -105dBm Signal/Noise Ratio: >85dB Border Upon Channel Rejection: >70dB T.H.D.: