Sennheiser HDR 180 Specs

Type Open, Circum-aural Digital

Wireless Range Up to 320' (97.5 m)

Transmitting Frequency Range 2.4 to 2.48 GHz, Auto-Selecting

Impedance 32 Ohms

SPL 110 dB

THD

Frequency Response 18 Hz to 21 kHz

Charging Time Approx. 16 Hours

Operating Temperature 32 to 104°F (0 to 40°C)

Power Battery or AC Power

2 NiMH-Akkus Typ AAA, 1,2 V, 600 mAh

Rated Input: 100-240 V, 0.2 A, 50/60 Hz

Rated Output:5 V DC, 500 mA

Weight Headphones: 7.20 oz (204 g) (Without Batteries)