Product Specifications Audio Driver Unit : 40 mm Volume Control : Yes (Rotary) Audio Modes : Mute: Operates when RF signal is weak or not received Effective Range : Approximately 33 ft (10 m); 13 ft (4 m) at ±45° line-of-sight Transmitter : Right 2.8 MHz, Left 2.3 MHz; (Frequency modulation) Frequency Response : 10 - 24,000 Hz General Type of Use : Home Diaphragm : PET Design : Over-the-head, Home-music/movie/games Power On/Off : Manual Power switch turns headphones ON/OFF. RED LED illuminates Headband : Wide, Self-adjusting Magnet : Neodymium Hardware Headphone Type : Open-air, Dynamic Communication : Infrared Inputs and Outputs Phono Input(s) : 1 (Stereo L/R phono plugs) Audio In : Analog Phono Input (left/right), Analog Stereo Input mini jack (x1) Power Power Requirements : Rechargeable nickel-metal hydride battery (supplied) or commercially available (size AAA) alkaline batteries Battery Type : Rechargeable Ni-MH battery pack (supplied); AAA x2 (not supplied) Battery Life (Approx) : 60H (with fully charged supplied NiMH battery pack); 28H (with AAA type alkaline battery) Battery Charging (Approx) : 16H (to fully charge an empty battery); Battery is charged by placing MDR on TMR Recharging Time : 24 hours (Approx.) Internal Power Supply : Transmitter: Supplied AC adapter (9V) Weights and Measurements Cord Length (Approx.) : 39 3/8 in. (1.0 m) Stereo connecting cable Dimensions (Approx.) : Transmitter: 5 1/2 x 2 3/8 x 4 1/2 in. (140 x 60 x 105 mm) Weight (Approx.) : Headphones: Approximately 7.06 oz. (200 grams) Including supplied battery Transmitter: Approximately 1 lb. 5.30 oz. (150 grams)