The 2108 Series is a totalizing counter housed in a DIN-sized (24 × 48 mm) enclosure. The count input (slow speed) and reset input can be by contact closure and by NPN open collector transistor. The high speed input (7 kHz max.) requires a 4 to 30 VDC voltage pulse and is compatible with 2- and 3-wire DC proximity switches and encoders. The unit is powered by a 3 volt lithium battery with an eight-year life. When changing the battery, the current count value is retained long enough to allow battery replacement without losing the count value. The unit can be set remotely or from the front panel. The front panel reset can be enabled or disabled with terminal jumpers on the back of the unit.