A pocket sized mini refrigerator holds insulin pens, vials and needles for mobile diabetics. At night, the refrigerator is plugged into the wall to provide both recharge power for the battery and overnight cooling. Cooling is provided by the Peltier principle in which is a solid state device passes current through a junction which cools one side and passes the heat to the opposite side for rejection. A 7.5 Volt video- camera- type battery provides from 4 to 12 ours of cooling. The unit dubbed the ‘TravelMate’ is available from Olaf Diegel, Massy University, New Zealand.
NASA Tech Briefs, April, 2004, p. 20.