Sony 900 MHz RF Wireless Headphones

Sony MDR-RF960RK 900 MHz RF Wireless Headphones with Auto Tuning
Transmitter: The system comes with an RF transmitter that connects to an audio source via a minijack or left and right RCA audio jacks. The transmitter sends a 900 MHz signal to the headset, using one of three selectable transmission channels. The transmitter has an automatic On/Off function. The transmitter switches on and begins transmitting when it detects an audio signal, and will switch off if it detects no audio signal for 10 minutes. The transmitter also functions as a storage stand/charger for the headset when not in use.
Headset: The ear cups fit comfortably over your ears with a closed circumaural design that follows the ear's natural shape. The right ear cup has the volume dial and tuning button, while the left ear cup houses the supplied rechargeable batteries.
Auto Power On/Off: The headset has a self-adjusting double headband with a built-in auto power on/off sensor.