Fangrui Product Details Operating Environment:-10 C -52 C Relative Humidity (- Rh)storage Temperature:-20 Cto 60 C(-4 Fto 140 F) It Responds To All Halogenated (containing Chlorine Or Fluorine) Refrigerants, Including:cfcs - E.g. R11, R12, R500, R503 Etc.hcfcs - E.g. R22, R123, R124, R502.hfcs - E.g. R125, R134a, R404a.blends Including -50, Hp62, Mp39 Etc Detect Ethylene Oxide Gas Leaks In Hospital Equipment,detect -6 In High Voltage Detect Most Gasses That Contain Chlorine, Fluorine And Bromine (halogen Gasses) Detects Cleaning Agents Used When Dry Cleaning Such As Perchloroethy,detects Halogen Gasses In Fire Extinguishing Systems Charging Current:5vdc 1a Sensor Principle: Heated Diode Sensitivity: Max 4g/ Yr Alarm Mode: Sound And Light Alarm, Lcd Display Battery: Built-in Rechargeable Lithium Battery 3.7v 3000mahworking Time:continuous 6h Charging: 4 Hours Note: Due To Different Production Batches, There May Be Slight Differences In Products. Colour:photo Color Material:plastic Package Contents: 1 X Halogen Le