Directed Electronics Digital Tilt Sensor 507M, added this to my APS 997N alarm system today. Works just as well as described. Also advertised as an anti-jacking sensor. Took less than 5 minutes to wire into the instant negative trigger of the alarm. Red to Power, Orange to Ground and Blue to input of alarm. Auto sensing self leveling, gives a 5 second negative pulse after motion is detected. 1 degree variance from level set as default. $26.70 including shipping from an Ebay retailer.
