Untangle your mind and relax with crisp, personal audio without wires. They alsofeature a comfortable headband and long battery life up to 25 hours.Specifications900 MHz Analog RF wireless headphoneBullets• Wireless FM headphones for cord-free listening• 40 mm driver units for expressive sound• Easy-adjust headband for long term comfort• Noise reduction system for minimal transmission noise• Automatic tuning for optimum signal reception• Up to 45 meter (150 feet) reception range 1• Approximate 25 hour battery life 1• Fast recharge: approximately 3.5 hours = full charge 1• Volume control on headphones• Easy connection of TV, Hi-Fi, and other componentsAudioAudio Modes Mute: Operates when RF signal is weak or not receivedChannel Selection Select by a slide switchDriver Unit 40 mmEffective Range Approximately 150 feet (45 m)FrequencyResponse 10-22000 HzTransmitter Ch1: 915.5 MHz, Ch2: 916.0 MHz, Ch3: 916.5 MHz(selective, FM Stereo)FeaturesCordless HeadphonesEnjoy high-fidelity sound, at home, in wireless freedom.Long-term comfortThe easy-adjust headband allows for long-term comfort and ease-of-use.Expressive sound40mm drivers deliver deeper bass and audio clarity for a superior home entertainmentexperience.Quality soundWireless radio-frequency transmission provides quality indoor transmission. (Up to approximately150 ft)¹Fast chargingQuick charging your headphones is a breeze with the secure charging system. A 3.5 hour chargewill produce a full charge of approximately 25 hours. recharge function.MDR-RF985RK