iButton Data collector/reader L812, Stainless steel shell, durable, waterproof, shockproof, antimagnetic, anti-disassemble. Product Introduction: Name: Contact Guard Tour Checking (Short wand)Model: L812Memory:2,000 records/8,000 recordsSize: 120*24.5 mmWeight: 180gPower Supply: one 3V lithium battery Product Features:Stainless steel shell, durable, waterproof, shockproof, antimagnetic, anti- ...