... 000 records. . Communication: USB, no need to install USB driver, high-speed download data..Power: 3.6 V lithium battery, long life ... light,label(three-in-one function)various shape and dimension for optionalLong life(more than 20 years)Checkpoints can be ... and unique ID number.Used as patrolman identification.1. Ideal for Security Personnel, monitoring Factories, Offices, Hotels, Car parks, Shopping ...