SC3L series Hour meter or Elapsed Timer is suit for manufacture, all kinds of electronic & electric products, Medical treatment appliance, Industry equipments that its life count , in office, in home, industrial, or in other anywhere need accumulative total time, etc. its rang from 1 second to 999999days and 23 hours. This timer is easy to use with compact size and pretty form. The big size LCD display is so clear. Features 1) LCD display with 6 or 8 digital. 2) Reset terminal or reset on front panel 3) Power reserve within battery to use for 6 years 4) Input signal voltage: Switch or TTL 5) Battery capacity: 6 years 6) Range: 99999.9h, 99h59m59s, 9999h59, 9999d23h, 9999h59m59s, 999999h59m