Sony MDRRF925RK Wireless Headphone (Discontinued by Manufacturer)
No   more fussing with messy wires, The   MDR-RF925RK wireless headphones system gives you the freedom to travel up to   150 feet from your sound source while delivering stereo quality sound, This system includes Ni-MH rechargeable   batteries - 900MHz RF wireless   transmission and headphones with a 40mm driver for deep bass. An auto tuning   feature conveniently scans up and down the band to automatically tune in   channels. The MDR-RF925RK wireless headphones system enables an easy   connection to a wide variety of sound sources. Package Contents - MDRRF925RK Wireless Headphone Rechargeable   Ni-MH Battery Pack, Stereo connecting cable Cord Length (Approx.) : 39 3/8   in. (1.0 m) . Connectivity Technology   - Wireless, Wireless Technology - RF, Wireless Operating Distance - 150 ft, Sound Mode - Stereo, Minimum Frequency Response - 20   Hz, Maximum Frequency Response - 20 kHz, Battery Information - Maximum   Battery Run Time - 18 Hour, Earpiece Design - Over-the-head, Earpiece Type - Binaural, Earpiece Controls - Volume, Driver Type - Neodymium, Driver Size - 1, 57", Physical Characteristics: Form Factor - Ear-cup. Limited warranty 3   months for parts and 3 months for labor.What’s in the box :Sony MDR-RF925RK Wireless RF Stereo Headphones, Transmitter, Power Adapter, Rechargeable Battery Pack and Limited 90-Day Warranty Parts & Labor.