Push button test to determine available battery power. Chassis: Non-ferrous alloy cover and base, 8-3/8″ (212.72 mm) x 2″ (50.8 mm) x 2-5/8″ (66.67 mm). Tamper proof cover screw sets unit into alarm upon unauthorized removal of the cover. Power/Electronics: 9 volt battery powered. Modern, solid state electronics. Magnet activated. Doors: For inward or outward swinging doors with 4″ minimum stile. Alarm/Horn: Alarm sounds for 2 minutes, shuts off and automatically rearms itself. Piercing, high frequency horn. Rated for 90 decibels at 6 feet. Cylinders: Inside cylinder operation to arm or disarm unit using 1-1/8″ (28.57 mm) mortise cylinder. Outside rim cylinder operation standard. (Order cylinders separately). Hand: Non-handed. Finishes: Powder coated painted finishes: AL BRZ, RD. Hardware finishes: US10, US10B, US26, US26D.