Sennheiser RS-40 Ultra-Light Wireless Hi-Fi Stereo Headphone System

RS40 Stereo Wireless Headphones, Black - The RS 40 has been designed on the open supra-aural principle and can, like its counterparts, convenientlybe stored on the transmitter, where its environmentally friendly rechargeable battery is automatically recharged. The RS 40 features a wide frequency response, very spatial sound reproduction and a powerful bass response.  Sennheiser, one ofthe leading Headphone manufacturers, now offers you incredible freedom of movement when listening to Music or using your computer; with these 900MHz RF wireless Headphones  This headphone has been designed on the open supra-aural principleand can conveniently be stored on the transmitter, where its environmentally friendly rechargeable Battery is automatically recharged  The 900MHz technology utilized in this headphone system allows you to walk not only around the room but toother rooms or floors in your home and still remain connected Other features include a Frequency response of 20-20,000 Hz  Maximum SPL - 96dB  Switchable Carrier Frequencies - 3 for 433 MHz variant - 2 for 863MHz variant -3 for 925MHz variant  Operating Time Per Battery Charge - roughly 4 hours  Built-in Audio filter for eliminating TV interference  Weight (incl. battery) - approx. 5.6 oz. Technical data  Headphonetype: Wireless Design principle: Open ear Earpiece: Supra-aural Headband style: Over the head, adjustable In the box: Sennheiser RS40 wireless stereophone, transmitter, NiMH rechargeable batteries, operating instructions,warranty information Frequency response (+/- 3 dB): 20 to 20,000 Hz Tuning range (receive): 100 meters