The ATU-620 is a battery-operated asset tracking device designed for reliable long-term use with minimal maintenance. It has built-in motion and cellular antennas, is weatherproof, and can store 2,000 messages on non-rechargeable batteries. The device is used to track assets, trailers, and cargo and connects to CalAmp's software for remote device management, configuration, and data collection. It has internal GPS, cellular, and SIM components and supports various cellular networks globally.