Stereo headphones.   900MHz RF technology allows user freedom from wires.   Operating distance up to 150 ft from cradle/transmitter.   No line-of-sight limitations–signal transmits through walls, floors and ceilings.   Sound is always clear.   3-channel transmission to reduce frequency interference.   Inductive charger is connected to an AC/DC power source and transfers energy without making direct electrical or mechanical contact to the inductive receiver.   Headphones get recharged as soon as placed back on the headphone charger.   Convenient power, volume and tuning controls located on headphones.   Auto tuning makes crisp clear sound available at the touch of a button.   Lightweight design and adjustable headband.   Includes 2 AAA NiMH rechargeable batteries