About Us

We, Additional Technology Security Inc., a California cooperation dba Sentry Sensor, are manufacturing products with reed switch application, especially in magnetic contact switches. The factories are location in China and Taiwan. Other product lines are LED light, temperature sensor, and so on.

Advanced processing technique, quality material plus strict management, come into high quality products. Most of our products have passed safety approvals of UL, and CE. We can offer Sentry Sensor brand, as well as OEM and ODM for your special requirements. Whether it is extra long leads, supervisory loop (Tamper switch), adding resistors to your switches, special magnet, heavy load reed or private labeling your company name, Additional Technology Security Inc. is here to serve you. 

Warmly welcome customers for all over the world.