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Features: Semiconductor refrigeration is a kind of refrigeration expertise which produces unfavorable thermal resistance, which is characterised by non-moving elements and excessive reliability. Suitable for small area cooling, semiconductor refrigeration learning theory, investigate ideas advanced cooling package planing. The cooling impact is determined by the dimensions of the cooling space, ambient temperature, adiabatic, sealing etc. Can be used as dual-core cooling, air cooling device, cooling equipment. Stable paintings and occasional noise, no refrigerant required. Specification: Material: aluminum + plastic fan Voltage: 220V Cooling core: 2* TEC1-12706 Length: 20cm / 7 Weight: Approx/57 Wiring method: V+: All pink cord (any V+ is ok) V-: All black wire(any V- is ok) L N: Power cable