A thermoelectric module is a solid state device which can operate as a heat pump to transfer heat utilising the "Peltier effect." The three modules are suitable for cooling or heating applications up to 100 degrees C. Measures: 40 x 40 mm with lead wires. Temperature Differential (DT) (Th=27 degrees C) : >=68 degrees C Optimum Input Voltage (Vmax) (Th=27 degrees C): 15V Optimum Input Current (Imax) (Th=27 degrees C): 4A Maximum Cooling Power (Qmax): 33.4W