Sennheiser RS 165 Wireless Headphones Digital Over Ear

Frequency response: 18 - 21,000 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, closed
Weight: 300 g (incl. batteries)
Operating time: up to 18 hrs
Audio input: 1 x 3.5 mm stereo
System Range: Up to 30 m
Signal-to-noise ratio: typ. 85 dBA at 1 Vrms
Modulation: 8-FSK Digital
Carrier frequencies: 2.4 – 2.48 GHz
See photos for condition.