MDR-IF630K

Cordless Infrared Headphone system has extended range, up to 33 feet (10m) direct distance from the transmitter and offers full listening enjoyment throughout the room or listening area
Noise Reduction Transmission System is designed to reduce extraneous noise and hiss and allow the headphones to receive the signal more clearly (incompatible with other cordless headphone systems)
Sound Mode Switch (Normal/Voice Enhanced) on headphones provides for Normal for high fidelity listening or Voice Enhanced to emphasize voice or dialogue, recommended when watching movies, especially at low volume and for individuals who may be slightly hearing-impaired (not a substitute for hearing aid)
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 12Hz
PET Diaphragms ensure high rigidity for minimum distortion, and low mass for excellent high-frequency response
Neodymium Magnets pack more magnetic energy per ounce than conventional ferrite, samarium cobalt or aluminum magnets and produce powerful bass and clear treble sound
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
Comfortable Closed Circumaural Design with cloth covered earpads offers added comfort for extended listening sessions
Automatic Headphone Battery Charge System with built-in Nickel Metal Hydride (Ni-MH) battery charges when headphones are set onto the transmitter
Type Dynamic, closed circumaural
Driver Unit 30mm diameter
Infrared Modulation Frequency Modulation
Infrared carrier Frequencies Right 2.8MHz, Left 2.3MHz
Effective Range 33 feet (10m) forward, 4m at ±45 degrees
Magnet Neodymium
Frequency Response Headphones: 12-24,000Hz
Transmitter: 20-20,000Hz
Distortion Less than 1% (1kHz)
Headphone Power Requirements Built-in Ni-MH rechargeable battery
Transmitter Power Requirements DC 9V (from supplied AC power adapter)
Battery Life Headphones: Approx. 22 hours with fully charged supplied Ni-MH battery