iButton Data collector/reader L812, Stainless steel shell, durable, waterproof, shockproof, antimagnetic, anti-disassemble. ... Features:Stainless steel shell, durable, waterproof, shockproof, antimagnetic, anti-disassemble. With genuine leather cup to protect the wand Working principle:Setup ... the transfer of bank, bus transfer and so on. iButton reader with 8000 records memory