... output short circuit (can be change for your requirement);SMOKE SENSITIVITY: meet No.UL217 standards. Testing standard: 0 ... Attached please find one copy of instruction, one smoke alarm SS-668, one bracket and two fixing ... fix the bracket with screw, and connect the smoke sensor according the line color, then spin it ... bracket. Inside the room every 25~40 square meter, 0.5~2.5 meters above the important ...