G100 is a portable iButton reader designed for maximum durability in both indoor and outdoor applications.There are LED light and sound prompt when reading IButton successfully. FEATHER: super-reinforced aluminum-alloy case; shock-absorbent internal design; Completely Waterproof,Sealed against liquids; firm and durable; auto prompt when working; warning when low voltage working Low-Power working,reading 160,000 cycles without charge; Data storage safely,EEPROM Storage for 10yrs without power High reliable design.Using long life components SPECIFICATION: Operating Temperature -40C-+85C Relative humidity 10-98%RH Reading time <10ms Dimension(LxWxH) 138mm x 43mm x 23mm Inner power supply 9VDC 1200mA Power Supply DC 9V Alkaline Battery Weight 139g Working Current Less than 20mA, 4uA for static current Data storage time >10 years Key Applications: Devices Checking and management,guard tour system for patrolman and so on.