Electrical Counters: Counter Type - Electronic Time Counter; Application - Count-up; Digits - (7) 8.6 mm H - LCD; Count - max - 999999.9hr or 3999d23.9hr (selectable); Speed - 60 Hz (Max); Voltage - Internal Lithium Battery; Connection - Screw Terminals; Reset - Manual; Mounting - Panel; Dimension - 1.89"W x 0.94"H x 1.91"D (48.0 x 24.0 x 48.5 mm); Additional Information - Operating Temperature: -10 to 55 deg C (14 to 131 deg F); Manufacturer Series - H7ET