Operating Voltage Range: 5 to 16 VDC from a regulated power supply (power usually supplied from host controller); Tamper Output: Open collector, active low, 32 mA max sink current; Display Type: 6-digits, 7-segment, red color LED display; LED Control Input: Dry contact, normally open (N.O.); Operating Environment: Suitable for indoor and outdoor use (meets IP65); Operating Humidity: 0 to 95% (non-condensing)en