These Peltier modules from PMD Way use the "Peltier" effect to transfer heat. This essentially creates a "cold side" and a "hot side" on the unit. Applications include biomedical instruments, consumer products like thermoelectric cooling water coolers, thermoelectric refrigerator, industrial equipment, laboratory and scientific instruments etc. You must use a heatsink with Peltier Modules if using for more than two seconds. Specifications: Dimensions: 40 x 40 x4.2mm Attached wiring around 100mm in length Resistance: 3.0~3.3Ω Particles: 127 △TmaxQC=0(C): 60°C Operating voltage 12V DC (Vmax: 15.5V) Cooling power: Qcmax 36W U=standard(V): 12V Pressure=kg/cm2: 85N/cm2 Operating temperature: -55~83°C Don't forget to check out our full range of Peltier modules if this doesn't meet your needs. And as always, all orders receive free delivery. And remember ... if you: can't find what you need not sure what to order want a bulk deal need technical support or just want to have a talk ... Please email us via [email protected]. To keep up to date with new products, news, tutorials and more - we're on x, Facebook, Instagram, threads, reddit, and instructables.