The RCA WHP141B Wireless Headphones let you experience the full freedom of wireless, personal sound, with no line of sight limitations, thanks to the RCA patented RF transmission technology. The headphone cradle and transmitter use double Phase Lock Loop technology, which maintains a clean and consistent audio signal so you can roam almost anywhere in your house while enjoying crystal clear music or TV sound. And the compact, comfortable design of our wireless headphones provides full, rich sound without the bulkiness of most other full size headphones. The WHP141 RCA Wireless Headphones transmits audio signal up to 150 feet, through walls, floors and ceilings although the range may vary depending on environment and surrounding structures. Phase-Lock Loop technology locks in frequency to prevent signal loss. 40mm speakers provide outstanding sound performance with a three channel selection on the headphones and transmitter for easy tuning. Headphones charge on the transmitter for easy storage and use. Ideal for dorm rooms, bedrooms, home entertainment centers and is compatible with almost any audio source, such as DVD, CD, DBS or HDTV.What s in the box: RCA WHP141 Wireless Headphone, Power Adapter, 3.5 mm Jack Adapter and 2 x NiMH Rechargeable Batteries.