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there are two alarm points of low concentration and high concentration
one product manual
Step 2: Fasten the chest strap
Accurate Double Thousand Bits
[ANTI-SLIP TEXTURE] This product is designed with anti-slip texture
Four In One Gas Detector Oxygen Carbon Monoxide Hydrogen Sulfide Combustible Gas Detector Toxic And Harmful Gas Alarm Blades there are two alarm pointsShips FREE Handling Day: 1 3 Days, Arriving Day: 15 35 Days[SHORTDESCRIPTION] Packing List Alarm * 1 Features Sound light shock triple alarmPut the instrument in the space that needs to be tested, if the gas master specified concentration value, there will be sound, S flash, vibration alarm, to avoid unnecessary losses. Built in battery charge directlyPortable fast charging, a variety of charging methods, with the use of charging, plug charging mobile
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