Fangrui Product Details [2.4ghz Wireless Iem System]the Wireless In-ear Monitor System Adopts 2.4g Wireless Transmission, With Lossless Sound Quality And Low Noise/low Latency. One-touch Switching Of Mono/stereo Input Provides Smooth Frequency Response For Any Headphones. [long Battery Life]built-in Rechargeable Lithium Battery, Which Can Last Up To 12 Hours Per Use After A Full Charge, Ensuring Your Performance Is ! The Delay Is Less Than 12ms. [one-to-many]one Wireless Transmitter Can Pair With Multiple Receivers To Send Signals. The Wireless Transmission Distance Is 90 Feet, Which Is Very Suitable For Small And Medium-sized Stage Performances And Daily Band Practice.2.4g Wireless Technology, Low Latency, No Compression; [support Stereo And Mono]connection Technology: Wireless, Wired; Headphone Jack: 3.5mm Jack; Transmitter: 3.5mm Jack [ Lavalier Design]the Clip Design Can Be Easily Clipped To A Backpack Pocket Or Clothes. Small And Cute, Not Easy To Fall Off, Allowing You To Fully Immerse Yourself In The World Of Musi