Sony MDR-RF915RK

Wireless Design lets you move inside and outside your house and still enjoy music and TV sound, and lets you 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
900 MHz Radio Frequency (RF) Transmission provides better sound quality and greater
30mm Diameter Driver Units are larger than many portable headphones for deeper bass, lower distortion and wider dynamic range; low frequency response extends down to 20Hz
PET Diaphragms ensure high rigidity for minimum distortion, and low mass for excellent high-frequency response
Ferrite Magnets combine high energy and small size for ample sound output
Comfortable Open-Air Type Supra-Aural Headphones fit securely for maximum frequency response reception
Double Headband with self-adjusting mechanism conforms to the curve of your head for a fit
Built-in Rechargeable Ni-Cad Batteries are more convenient than ordinary replaceable batteries, and when fully charged provide up to 23 hours of operating power
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
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
AFM Transmission System resists static and distortion for higher fidelity
Complete Kit supplied, includes transmitter, headphones, connecting cord, UniMatch® plug adapter and AC power supply
Supplied Connecting Cord goes directly to headphone output of your high fidelity system for easy connection to hi-fi system, TV or VCR
RF Modulation Frequency modulation
RF Carrier Frequencies Channel 1: 913.5 MHz
Channel 2: 914.0 MHz
Channel 3: 914.5 MHz
Effective Range 150 feet
TRANSMITTER
Power Requirements AC 120Vm 60Hz when used with supplied AC power adapter which connects to the DC 9V jack
Audio Input Stereo L/R phono jacks
Supplied 3 ft. connecting cord goes from stereo mini plug to L/R phono plugs
Supplied UniMatch plug adapter converts stereo mini plug to stereo phono plug
HEADPHONES
Type Open air, dynamic, wireless
Driver unit 30mm diameter, dome type
Diaphragm PET
Magnet Ferrite
Headband Double band, self-adjusting
Frequency Response 20-20,000Hz
Power Requirements Headphones: Ni-Cad battery, supplied
Transmitter: 9V AC with supplied adapter
Battery Life Approx 23 hours with fully charged Ni-Cad battery (built-in)
Sensitivity 105 dB/mW
Impedance 24 ohms at 1 kHz
Tuning Manual
Volume Rotary control
Power Handling Capacity 1000mW (IEC)