... recorded the largest number of 30,000 (GS-5000A) Guard Tour System with auto-reader mode design I. Product Production ... :1. GS-5000A Guard Patrol Probe, without the use of keys, auto-reader ... sound Working humidity range30%--90% Battery2 of 3.6V 2000mA re-chargeable lithium batteriesStandard accessoriesLithium batteries, communication lines, holster, ...