... 8,000 recordsSize: 120*24.5 mmWeight: 180gPower Supply: one 3V lithium battery Product Features:Stainless steel shell, durable, waterproof, shockproof, antimagnetic ... leather cup to protect the wand Working principle:Setup site button in the place where you need to patrol, the site ... arrives patrol point will only have access to the site button which is mounted on the wall (or other supporting materials ...