Sony Noise Reduction 150 feet Long Range Wireless Dynamic Stereo Headphones with Volume Control & Wide Comfortable Headband for All Philips 32PFL4505D, 40PFL3705D, 40PFL5505D, 40PFL7505D, 46PFL7705DV, 55PFL7505D, PET729 LCD HDTV Flat Screen Television Noise reduction technology reduces interference from other distracting noise around you and neodymium magnets gives you a high fidelity sound reproduction. Padded Earcups, Closed Dynamic, Comfortable fit with adjustable headband and complete coverage of the ear with 40mm diameter drive units for deep bass Volume control on ear piece, auto power On/Off, Manual tuning via switch on both base and headphones Wireless Analog 900MHz radio frequency transmission with up to 150 ft transmission range, even through walls Supplied rechargeable nickel-metal hydride battery automatically charge by placing the headphones on the transmitter base station