Ray Foster WH40 Standard Wax Heater, Single Unit. Features three compartments, with two measuring 2-1/8" x 1-3/4" x 3/4" deep, and one 2-1/4" x 3-3/4" x 3/4" deep. They have a hinged lid to keep out contaminants, indicator lights, and an on/off switch. Rugged construction and reliable components promise years of trouble free service. Single preset temperature of 160 F (71 C).