Fangrui Product Details 1. Digital Display: Iem System Receiver Is Equipped With An Lcd Screen That Displays Frequency, Channel And Battery Level For Easy Operation. 2. Efficient Reception: Wireless Iem System Receiver Uses 526-535mhz Frequency Band, Which Is To Receive Rf Signals From The Transmitter. 3. Stable Signal: Wireless Monitor System Receiver Antenna Adopts 1/4 Wavelength Design To Enhance Signal Reception. 4. Easy To Carry: Iem Receiver Runs On 2 X Aa 1.5v Batteries, And Portable, And Can Be Used Up To 50 Meters Indoors And Over 100 Meters Outdoors. 5. Clear Sound: Stereo Iem System Receiver Frequency Response Covers 20hz To 18khz, Providing A Clear, Hifi Sound Experience. Item Type:wireless Monitor System Receiver Battery:2 X Aa 1.5v Batteries (shipped Without Batteries) Use Distance:indoor 50 Meters, Outdoor More Than 100 Meters Frequency Response:20hz To 18khz Antenna:1/4 Wavelength Frequency Band:526-535mhz Color:black Material:plastic Package Contents: 1 X Receiver 1 X Headphones 2 Pairs X Ear Only The Above