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 components Actual battery life will vary based on product settings, usage patterns, battery and environmental conditions.