Includes RF stereophone, transmitter and AC power adapter; Provides cordless listening from your stereo, video or computer sound source; Transmits through walls or ceilings; Five channel stereo transmitter provides interference-free personal listening; Multiple sound source apability when used with additional transmitters; Closed ear cushion for better bass and isolation; Stereo/Mono switch, power indicator, and volume control; Rechargeable NiCad batteries; Frequency response: 20-20,000 Hz.