My host camp of department product YJ-10 Smoke Detector the device detector , battery 5 is used for a power source , the second can check being finished to being 5.5 meters of following the Smoke Detector device away from the floor in 3-5 from four section. Have been a detector's turn to have volume to handle merit such as simple , being easy to carry about for a short time (the row cigarette is in charge of mark of seven section of Shanghai shrinking) , weight makes light of (be composed of aluminium alloy and PVC plastic), have lightened a job greatly intensity miscellaneous and trivial and working. Explore the buddy , agent , dealer working together now. Have good faith person ask contact with us.