Wireless Earphone Monitor System 2 Channel 4 Bodypacks Whole Metal UHF Stage Monitoring System for Studio 100‑240V UK Plug Item Type: Wireless Earphone Monitor System Material: Iron Transmitter Parameters: Frequency Interval: 32MHz Preset Channels: Preset 40 Groups of Channels Set 4 Groups Respectively Earphone Output: 6.35mm Socket, Volume Adjustable Antenna Output Socket: TNC Socket (50Ω) Receiver Parameters: Single Receiver Battery: 2 x AA Batteries (Not Included) (4 Receivers) Frequency Interval: 32MHz Preset Channels: Preset 40 groups of channels set 4 groups respectively, the same group of channels do not interfere with each other Maximum Deviation: ±48KHz Integrated S, N Ratio: >94dB (1KHz-A) Integrated T.H.D: <3% at 1KHz Integrated Response Frequency: 80Hz-15KHz±3dB Output Power (32Ω): 2 x 35mW at 1KHz Output Socket: 3.5mm Earphone Socket Antenna: Fixed 1/2λ