Additional / replacement headphones for the RS 165 digital wireless headphone system.    
    
HDR 165    
    
    
    
Frequency Response    18 -21,000Hz
Max Sound Pressure Level    016 db, 3% THD
THD, Total Harmonic Distortion    <0.5%, 100dB SPL
Transducer Principle    Dynamic, closed
Weight    300g
Running hours    Max 18hr
    
    
1 Bass botton    
2 Volume - button    
3. Volume + button    
    
Main controller equipped on the headphone for user convenience    
    
Battery insert or replacement    
    
    
Rechargeable 2 AAA NiMH batteries included    
    
    
Model name    HDR 165
Manufacturer/Importer    Sennheizer / syncroad Korea
Manufactured Country    China