Features: * Adopt high quality semiconductor heating sensor, featuring good stability performance.  * Design with MCU intelligent supervise control and SMT chip technology, providing intelligent protection of family safety.  * Can give visual and audible alarm in time when leakage concentration reaches the set value.  * LED-numeric display technology, shows clearly instant gas leakage concentration. * Feature three indicators: POWER, STATE, ALARM. * Plug and play, simple to use. Portable body design, easy to carry and store. * Can be used to detect artificial coal gas, natural gas, liquefied petroleum gas and other combustible gases. Note:  There may be 1-3mm errors due to manual measurement.  Specifications: Model: BRJ-502D Material: ABS+Electronic Components Color: White  Plug Type: EU Plug / US Plug (Optional) Power Voltage: AC 100V~240V Power Frequency: 50 / 60Hz Rated Power: <4W Alarm Concentration: 3%LEL~20%LEL Alarm Loudness: ≥85dB Working Temperature:  -10℃~50℃ Working Humidity: <97％RH Item Size: 12 * 6.9 * 2.8cm / 4.72 * 2.72 * 1.1in Item Weight: 93g / 3.28oz Package Size: 13.5 * 7.5 * 5.5cm / 5.31 * 2.95 * 2.17in Package Weight: 148g / 5.22oz Package List: 1 * Gases Detector