Sennheiser RS 185 Headphone System

Headphone system with manual level control for precise sound reproduction. The right wireless choice for serious listeners.
Wireless， open， circumaural headphones with uncompressed digital audio transmission
Exceptional digital audio clarity and transmission range of up to 328ft/100m (line of sight)
High-performance Sennheiser transducers for precise， thrilling sound
Control the sensitivity of your analog input – choose between Automatic Level Control (ALC) mode to even out volume differences automatically or Manual Level Control (MLC) mode to manually adjust the sensitivity
Supports analog and digital audio inputs and allows toggling between the inputs
Balance control located on the headset for convenient adjustments
Multi-purpose transmitter – also functions as ‘easy-charge’ cradle and docking station
Multi-receiver transmission – transmitter supports up to two pairs of headphones simultaneously
Ergonomic design for enhanced wearing comfort
2-year warranty

What's in the box?
HDR 185 headphones/TR 185 transmitter/Optical cable/RCA audio cable/Power supply with 4 adapters (EU， UK， US & AU)/2 AAA NiMH rechargeable batteries/Quick guide

Specifications
Headphones
Frequency response 17 - 22，000 Hz 
Max. sound pressure level 106 dB at 1kHz， 3% THD 
THD， total harmonic distortion <0.5 % at 1 kHz， 100 dB SPL 
Transducer principle dynamic， open 
Weight 310 g (incl. batteries) 
Operating time up to 18 hrs 
Transmitter
Audio input 1 x RCA stereo， 1 x optical digital 
Power consumption ≤ 0.3 W (standby) 
System
Range Up to 100 m 
Signal-to-noise ratio Analog input: ALC typ. 85 dBA at 1 Vrms， MLC ≥ 90 dBA 
Signal-to-noise ratio Digital input: > 90 dBA 
Modulation 8-FSK Digital 
Carrier frequencies 2.4 – 2.48 GHz