EMX-1 wireless monitoring system, UHF wireless digital signal transmission, adopts highly integrated chip design, automatic ID code pairing, has extremely low latency and ultra-low noise, stable transmission signal, excellent reception headphone amplification effect, built-in lithium battery battery, about 5 hours, about 5 hours, is a portable wireless monitoring system. Frequency range: 560-590MHz (depending on the specific version) Delay rate: 4.5ms Adjustable channel: 16 adjustable frequency Channel spacing: 0.5-2.5MHz Modulation mode: digital modulation Frequency stability: 3ppm Frequency response: 40Hz-20kHz Working range: 30m (up to 50m in the best environment) Built-in working voltage: 3.7V, 1000mAh lithium battery Color: White Material: Plastic+Metal Package Contents: 2 x Receivers 1 x Transmitter 1 x 6.5mm XLR Adapter 1 x USB Cable 1 x Earphones 1 x Storage Bag Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.