TV Sound TVS-1130-1W Television Listening System TV Sound Television Listening System is a personal sound amplifier that allows you to watch TV at the volume you choose, without disturbing others Ultra-light, comfortable headset with a built-in, rechargeable lithium battery that lasts up to 10 hours, for clear, crisp sound only you can hear Wireless, rechargeable infrared system broadcasts to an area approximately 600 square feet (must maintain line of sight from base) TV Sound is a helpful and convenient accessory for people with hearing impairments Includes transmitter base, and 1 headset with adjustable volume and built-in rechargeable lithium battery; supports second headset (sold separately)