This part is a kind of semiconductor called TEC1-12715.

Function of this product has Thermoelectric Cooler.

Manufacturers : HB

Image and pinout :

Some of the text within the PDF file :

Hebei I.T. (Shanghai) Co., Ltd TEC1-12715 Datasheet 、 No. Items Symbol 1 Max. Operating Tem. T 2 Max. Cooling Power Qmax 3 Tem. Difference Max △Tmax 4 Input Voltage Max Vmax 5 Max. Current Imax 6 Resistance 7 Parallel R Parameter ＜90℃ 136 70 15.4 15.0 0.75±0.05 ≤0.05 ㎜ Condition Vacuum testing Tem Th=30℃ Vacuum testing Tem Th=30℃ Vacuum testing Tem Th=30℃ Vacuum testing Tem Th=30℃ Ambient Tem Th=25℃ 8 Lines 20AWG When the ambient temperature raise or fall 1℃, the module resistance will raise or fall 0.015 accordingly. [ ... ]

TEC1-12715 PDF Datasheet Download