Chip Type: TEC1-12705 Dimensions: 40 * 40 * 3.8mm Internal resistance: 2.5 ~ 2.8Ω (23 ± 1.1kHZ ambient temperature Ac test) Maximum temperature: Tmax (Qc = 0) more than 67 Operating current: Imax = 4.3-4.6A (nominal at 12V) Rated voltage: 12V (Vmax: 15V starting current 5.8A) Cooling power: Qcmax 50-60W Working environment: Temperature range -55 ~ 83 (high ambient temperatures drop directly affect the cooling efficiency) Package include: 1 x TEC1-12705 heatsink thermoelectric cooler module