Features
Sennheiser's top-of-the-line RF model
Circumaural hi-fi stereo headphones with velour ear cushions
Proprietary HiDyn plus® noise reduction delivers truly "wired" sound (S/N >85dBA)
On-hook charging
Includes 2 NiMH rechargeable batteries

Technical Data
Frequency Response 20 - 22,000 Hz
THD < 0.5%
Carrier frequencies (switchable) 925.0 MHz/926.0 MHz/926.5 MHz
Maximum SPL 101 dB
Signal to Noise Ratio > 85 dBA
Modulation FM stereo
Operating time Approx. 4 hours per battery
Power Supply BA 151 rechargeable battery
Weight (HDR 80 receiver) 5.6 oz