Sennheiser HME 100 Passive Headset has excellent passive attenuation and a wide fre-quency response, this new closed-back headset will make communications clear. The HME 100 is fitted with a volume control for the headphones; sensitivity control for the microphone; flexible, noise-compensated boom microphone for right- or left-side use; and a cushioned, foldable headband. A high-quality bag is supplied with the unit. FEATURES Lightweight and comfortable Volume control MKE 45 flexible boom microphone for right- or left-side use Mono/stereo switch Single-sided round cable TECHNICAL DATA - Headphones Transducer: dynamic, closed, cicumaural Frequency response: 45 - 15,000 Hz Nominal impedance: 150 ohms mono 300 ohms per system, stereo Passive attenuation > 10 - 40 dB Caliper pressure approx: 10 N TECHNICAL DATA - Microphone with Preamplifier Type: MKE 45-1 Transducer electret, noise-compensated Frequency response: 300 - 5,000 Hz Max. SPL 120 dB (distortion < 5 %) Output voltage: 400 mV ± 3 dB at 114 dB/SPL(as per RTCA/DO-214) Min. terminating impedance 150 ohms Operating voltage typ. 16 V DC (8-16 V DC, 8- 25 mA) as per RTCA/DO-214 GENERAL DATA Connection cable single-sided round cable, length 1.5 m Weight without cable: 350 g Connectors headphones: 1/4 inch stereo jack, microphone: PJ-068 Specials headphone volume control, mono/stereo switch Operating temperature: 15 to +55 degree Celsius Storage temperature: 55 to +55 degree Celsius