Sentry Technology Corporation designs, manufactures, markets and services traveling closed-circuit television (CCTV) technology products, including VideoRailway and SmartTrack. It manufactures traveling, robotic CCTV systems servicing customers in North and South America, Africa and Australia. VideoRailway features a single high definition/Internet protocol video camera that travels along straight and curved rail segments that can be configured in a continuous loop. The system is backwards compatible with analogue designs while also interfacing with the latest digital networks. SmartTrack is a traveling carriage with two fully programmable PTZ's. SmartTrack systems serve retailers, public transportation facilities and others. Its traveling video systems transmit images from a pan-tilt-zooms (PTZ) camera mounted on a carriage that travels along a rail attached to the ceiling of any facility. Its systems are operated using joystick console, cell phone or tablet, and over the Internet.