... smoking monitor on the wall.2,Power Connection Port.Smoke detector work after power connected.3,Power switch.Start work after closure4,Detector port ... install on the wall connect to power (from packing) (connected to power line ) (fitting) (connect with power safely) warning: 1,Red no- ... smoking signs are displayed to the gradient after power connected. 2,Should be warmed-up for 3 miniutes ...