This 15.5 cu.ft. chest freezer uses static manual defrost cooling to maintain constant temperature, with an externally controlled digital thermostat to ensure easy temperature monitoring. Extra thick 4 ½" thick insulation offers added efficiency and reliability. Additional features include a solid, easy-grip handle complete with factory installed lock, a sturdy set of casters, and counterbalanced hinges for comfortable loading and unloading. This unit includes a factory-installed probe hole to allow users to install their own monitoring equipment.