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.

Product Features

• Technical Information–Connectivity Technology–Wireless::Technical Information–Wireless Technology–RF::Technical Information–Cable Length–Not Applicable::Technical Information–Wireless Operating Distance–150 ft::Technical Information–Sound Mode
• Stereo::Technical Information–Minimum Frequency Response–20 Hz::Technical Information–Maximum Frequency Response–20 kHz::Battery Information–Maximum Battery Run Time–18 Hour::Earpiece–Earpiece Design–Over-the-head::Earpiece–Earpiece Type–Binaural
• Earpiece–Earpiece Controls–Volume::Earpiece–Driver Type–Neodymium::Earpiece–Driver Size–1.57″::Physical Characteristics–Form Factor–Ear-cup
• Limited warranty 3 months for parts and 3 months for labor.
• 150ft max signal reception
• 900MHz RF wireless transmission, FM stereo sound
• Charging time approx 16H; Battery life up to 15H, AC Adaptor (DC 12V) included
• Induction charging: not direct pin contact
• Volume control on ear piece, auto power On/Off