This gas leak detector is used to detect halogen gas with high sensitivity. It can detect leaks in air conditioning systems, freezing systems, etc. Specifications: Brand Name: SMART SENSOR Color: Black Material: ABS Detection gas: all refrigerant gases Sensitivity: less than 0.5 oz/year Alarm mode: sound alarm and light alarm Response time: instant Warm-up time : less than 20 seconds < br /> Continuous operating time: 9 hours (varies slightly depending on operating conditions) Power supply: 3 x 1.5V AA alkaline batteries (NOT included) Operating temperature: 050 / 32122 Storage temperature: - 1060 / 14140 Item Size: Approx. 15.8 * 6.3 * 3cm / 6.2 * 2.5 * 1.2in Item Weight: Approx. 173g / 6.1oz Package Size: Approx. 23.1 * 14 * 3cm / 9.1 * 5.5 * 1.2in Package Weight: Approx. 209g / 7.4oz Package List: 1 * Halogen Gas Detector 1 * User Manual (English)