Wireless In Ear Monitor System provides wireless monitoring for stage performances and studio recordings. Its design makes it portable and easy to use. High speed: High speed, low power consumption, long service life, no need to worry about the loss of battery. Feature: Small size yet has lossless professional sound quality, low noise, low latency, good resolution. 2.4GHz wireless transmission band, 24 bit/48KHz sample rate. 30 meters long distance effective transmission distance. One key to switch mono/stereo, meet the needs of your different device. Built-in rechargeable lithium-ion battery that can be conveniently by USB. Specifications: Sample rate: 24bit / 48KHz lossless digital transmission sound quality Wireless Band: 2.4GHz Delay: Less than 12ms -: 30 meters outdoor or 15 meters wall distance Lithium Battery Capacity: receiver 550mAh Charging Device: USB charging cable Signal-to-noise Ratio: -98dB Dynamic: 105dB Frequency Response: 20 to 20KHz, +1dB / -3dB color: Black material: plastic Package Contents: 1 x Receiver 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.