By selectable switching position on equipment back also applicable as narkosis gas alarm device (installation in height at eye level within sleeping range). Acoustic alarm (90 dB) already less than 10% of the minimum explosive gas concentration. Installation height for propane gas detection: approx. 20-40cm over ground. Fits into installation frame (see plug/plug sockets within range of electrical connection) resepectively Truma installation frame. Ready for use after approx. 90 seconds (yellow flashing control light). Acoustic signal disconnectible. It is recommanded to let it install by trade company. Voltage 12V DC: temperature -10°C-+40°C: humidity 30 -95%: acoustic signal with alarm approx. 90 dB. Delivery incl. installation frame.