The Trolmaster Smoke Detector (MBS-SD) is designed to alert users when smoke is detected inside their grow area. This is important as it alerts you to a potential problem so you can resolve it before it gets out of hand. General Information Up to 5 smoke detectors can be connected to a single Hydro-X controller. Output Voltage - 0~11.5V Maximum Current - 0.2A Working Environment - Temperature 32-122°F, Humidity=90% Dimensions - 160mm(L) x 86mm(W) x 86mm(H) Benefits Small Button for Address Assignment Built-In Photocell Detecting Day/Night Mode Plug & Play How to Use It’s important that the sensors stay dry and clean to prevent failure. Ensure that no water or condensation collects on the sensor. Comes with the following: 1 x Smoke Detector (MBS-SD) 1 x 16ft RJ12 Cable 1 x RJ12 T-Splitter