Thermo King's V-520 vehicle-powered temperature control system has been designed for small trucks. It has the new Direct Smart Reefer (DSR) controller - the latest in microprocessor control for direct-drive systems. Features of the DSR controller include easy-to-understand alarm codes for quick diagnostics and reduced costs, maintenance reminders, upgradeable software, battery protection features, continuous monitoring of the load and automatic startup and SmartPower electric standby. There are also new voltage options (24V and 12V).