United Security Products, Inc. has supplied quality magnetic contacts and sensors to the security alarm industry for over 30 years. With proven performance in more than 50 million burglar alarm installations, security systems dealers rely on USP magnetic contacts, pressure mats and automatic voice dialers to protect their customers. USP's Window Bug, glass protection sensor, and HUBs, Hold-up Buttons have provided the most innovative devices in the security industry. For your next installation, be sure to specify USP products.