Feature: 1. [Stable Frequency Band] Wireless earphone monitor system, UHF band phase locked PLL, improve comprehensive performance, anti frequency dropout and crosstalk. Frequency range is 550MHz‑580Mhz. 40 preset frequencies in the 32MHz band can be switched at will. Dynamic expansion circuit greatly improves the SNR. 2. [Reduce Distortion] Wireless earbuds monitor system for stage performance and sound broadcast box, built in limiter circuit, eliminating the distortion under too high input levels. Front panel 1/4 inch monitors have earphone jacks, which can replace traditional composite sound monitoring equipment. 3. [Large Range] The ear monitor system provides desktop stage monitoring with a wireless range of up to 300 feet and up to 250 feet to 350 feet under normal conditions. It also improves the SNR of the dynamic range, which gives the system the best interference resistance and shows the perfect original sound. 4. [Appearance And Display] Stage monitor system has an elegant LCD display panel with an LCD display low battery indicator on the receiver. The single receiver uses two AA batteries (not included) and efficient power circuitry for long service life. 5. [Stable Signal] Stage monitor transmitter receiver kit with 4 bodypacks, using advanced circuit design to clear the reception blind spot, so that the system's reception signal is stable. The casing is made of hard iron material, which can better guard the internal circuitry, suitable for professional stage performance monitoring. Specification: 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. Package List: 1 x Host4 x Receiver4 x Earphone16 x Eartips (8 Large and 8 Small) 4 x Clip2 x Antenna4 x 6.35mm Sound Cable1 x Adapter1 x Instruction Manual