Products Model: GK-600 Packing: BLISTER CARD Frequency Response: 20-22,000Hz Sensitivity Headset: 105dB±3dB/mW Rated Power Headset: 2x1.5V(AAA/UM4/NO.7) Signal/Noise Ratio: 48dB Maximum Operation Distance: 30M,360° Transmitter Power Required: 2x1.5V(AAA/UM4/NO.7) Features: Cordless Headphone with FM Receiver For TV set,VD,DVD,PC etc.Headphones are able to receive signals from transmitter in all direction even barriers such as doors,walls and glass. Description : Frequency Range: Headphone: F1:85.5MHz; F2:86.0MHz Transmitter: F1:85.5MHz; F2:86.0MHz FM RADIO:88-108MHz "Three In One" Function: 1.Headphone itself can receive FM radio signal. 2.With transmitter it can receive signals from other video/audio equipments. 3.With connection cord it can be used as common headphone. Components: Headphone 1PC Transmitter 1PC Connection Cord 1PC