Sennheiser HME 110 pilot's headset unboxing 

what's in the box of HME 110 pilot's headset?
The HME 110 pilot's headset with closed ear protector headphones provides excellent passive attenuation for the helicopters, propeller and turboprop aircraft. The Personalization of the headset is possible on a title block on top of the headband. The size of the headband is adjustable even to small heads e.g. for children. For easy and space-saving transportation the ear cups can be folded up. Technical Data Color: black Connector 6.3mm: stereo headphones, PJ-068 microphone Frequency response (microphone): 500 - 5000 Hz Transducer principle (Microphone): Electret - MKE 45-1 Frequency response (headphones): 45 - 15000 Hz Contact pressure: approx 10 N Ear coupling: circumaural Connection cable: 1,5 m Transducer principle: dynamic Weight w/o cable: 350 g Attenuation passive: more than 10 - 40 dB Nominal impedance: 150 Ohm mono/ 300 Ohm stereo Operating temperature: 10 degree C +55 degree C Output voltage: 400mV +/ 3dB / 114 dB/SPL Max. Sound pressure level (active): 120 dB Operating voltage (stand alone): typ. 16 VDC (8-16 VDC, 8-25 mA)