Operates on electricity only. Designed for use at fixed locations. The freezing compartment is divided into a freezing and a storage compartment for 8 x 0.6l icepacks. Two water filled walls separate these two compartments. Sophisticated electronics control the inside temperature providing an outside temperature alarm and constant temperature monitoring. Control panel situated at the front of the unit including 1 thermostat for temperature regulation, 1 green LED indicator for "Power On" Ice-pack freezing with vaccine: 2.4 kg/14.5h @ +32°C ambient temperature Ice-pack freezing with vaccine: 4.8 kg/29h @ +43°C ambient temperature