Main Features 1. Side scraps voice design, not water, not easy to cover. 2. The undervoltage yellow alert to remind replace the battery. 3. Split automatic switch, magnetron layering hailing device number to use, easier to save. 4. Shell with seismic, heat resistance and good light transmission. 5. Small size, light weight; the internal pressure serrated buckle, easy to slide; 6. Orientation bit features 4 super-bright red imported the diodes do azimuth lights, light-emitting diodes: 700mpl/m2 technical parameters 1. Power: 1604A6LR61 +9 V alkaline batteries (a) 1) Operating voltage: 9V 2) Operating Current: 136mA 3) The maximum open circuit voltage: 9.5V 4) the maximum short-circuit current: 2.7A 5) warning undervoltage voltage: 7.3 ± 0.5V 2, the performance of the whole: 1) still to early warning time: 30 ± 5s 2) pre-alarm time: 15 ± 3s) still the Xeon alarm time: 40 ± 5S 4) consecutive strong alarm time: ≥ 65min 5) consecutive Standby time: ≥ 15h, alarm loudness a) pre-alarm alarm loudness loudness (a distance of 1 m): ≥ 82dB b) strong (3 meters): ≥ 98dB to use the conditions, operating temperature: -25 to +55 ° C Storage temperature: -40 to +70 ° C ambient noise: ≤ 65dB, relative humidity: 95% to 100% 5) Atmospheric pressure: 86 to 106KPa Product Description mine for help for miners working underground, public security Firefighters and ambulance personnel generic products, according to the industry standard based on absorption of experience in the development of similar products at home and abroad, the use of sound and light technology developed new call for help, by the clock timer, micro sensor circuit, early warning and The strong police auto / manual control, tone clock circuit, buzzer output circuit, undervoltage warning circuit, with automatic alarm, compulsory alarm, position-indicating low voltage indication function. United States imported polycarbonate shell, chip integrated circuits, ultra-compact body design has a high scientific and technological content. It overcomes the large volume of existing domestic call for help, single function, the line is unstable, bulky mechanical switch, the pronunciation holes are easy to water, easy to cover shortcomings, is the ideal replacement. The instrument can be used in the environment of methane and coal dust explosion-proof type: Mine intrinsically safe, explosion-proof mark: Exibl Contact: mefo built Tel: 13165376735 fixed telephone 0537 -2789995 Fax 0537 2,789,995 QQ: 2,367,327,479 Want: haobogongkuangtian E-mail: 2367327479@qq.com Company Name: economic Ninghao Bo Mining Machinery Co., Ltd. Note: website images are for reference only, mainly in kind or consult our sales staff