- Sony 900MHz wireless stereo headphone system - Wireless design: lets you move inside and outside your house and still enjoy music and TV sound, and letsyou turn up the volume late at night without disturbing others- 150 Foot transmission range- For listening enjoyment upstairs, downstairs, virtually everywhere in your home and outside in your backyard- 900MHz Radio frequency (RF) transmission- Provides better sound quality and greater range- Adjustable headband with complete ear coverage- Easy rechargeable battery system automatically charges the headphones when placed onto the transmitter- 3 Transmission channels available, helps ensure optimum signal reception; convenient sliding selector control on the side of the transmitter- Includes transmitter, headphones, connecting cord, reachargeable battery, AC power supply- FM transmission system resists static and distortion for higher fidelity- Automatic power on/off: for both headphones and transmitter conserves battery life; transmitter turns on when it senses an input signal; headphones turn on when you place them on your head- Volume control on headset- BlackSYMDRRF925RK