Sony MDR-RF975RK

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 range than earlier wireless systems, and uses the same advanced technology as 900MHz cordless telephones
Mute Function helps eliminate noise through the headphones and cuts out the sound when no audio signal is available
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 18Hz
PET diaphragms ensure high rigidity for
Neodymium Magnets pack more magnetic energy per ounce than conventional ferrite, samarium cobalt or aluminum magnets and produce powerful bass and clear treble sound
Comfortable Closed Circumaural Headphones positions the drive units at correct distance from the ear canal and creates a sealed resonance chamber for superb deep bass; follows the natural shape of the human ear for greater comfort
Noise Reduction Transmission System is designed to reduce extraneous noise and hiss and allow the headphones to receive the signal more clearly
Double Headband self-adjusting mechanism conforms to the curve of your head for a fit that stays comfortable even during extended listening sessions
Single Volume Control in one earpiece conveniently adjusts volume for both stereo channels
Built-in Rechargeable Ni-MH Batteries are more convenient than ordinary replaceable batteries, and when fully charged provide up to 25 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
Automatic Tuning on Headphones for best reception of signal
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

GENERAL
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 toL/R phono plugs
Supplied UniMatch plug adapter converts stereo mini plug to stereo phono plug
HEADPHONES
Type Closed, dynamic, wireless
Driver Unit 30mm diameter, dome type
Diaphragm PET
Magnet Neodymium
Headband Double band, self-adjusting
Frequency Response 18-22,000Hz
Power Requirements Headphones: DC 3V, Sony Ni-MH battery (built-in)
Transmitter: 9V AC with supplied adapter
Battery Life Approx 25 hours with fully charged Ni-MH battery (built-in)
Sensitivity 105 dB/mW
Impedance 24 ohms at 1 kHz
Tuning Automatic
Volume Rotary control
Power Handling Capacity 1000mW (IEC)