... shop, hotel, restaurant, office building, school, bank, library, computer house and storehouse etc. * Technical specification 1) Operating voltage: DC 12V( ... Size: 107*35mm 12) Execute criterion: GB4715-1993 * Installation and test 1) (independence or wireless type) Talking the battery into ... the mounting base, then the detector into the base and turn it. 5) After installation, press the test button ...