Alarm Current: 174mA (max.); 116mA (12V In), 60mA (24V In) Dimensions: Diameter: 6.4 in. ; Width: 6.04 in. ; Depth: 1.00 in Mounting: 4-11/16 in. square back box or inside a metal enclosure Operating Humidity Range: 5-95% RH Operating Temperature Range: 0 – 50° C (32 — 122° F) Operating Voltage: Nominal: 12/24 VDC; Minimum; 8.5 VDC; Maximum: 35 VDC (power limited) Standby Current: 62mA (max.); 45mA (12V In); 27mA (24V In) Weight: 9.6 oz. (272 g) Wiring Gauge: 14-22 AWG