Here is information about what you might find in such a kit:

Peltier Module: The heart of the cooling system is the Peltier module or thermoelectric cooler. This semiconductor device generates a temperature differential when an electric current flows through it. One side becomes hot, while the other becomes cold. It usually comes with attached heat sinks.

Heat Sinks: The kit includes heat sinks to dissipate heat effectively from the hot side of the Peltier module. These heat sinks may have fans attached to enhance heat dissipation.

Power Supply: You'll receive a power supply unit to provide the necessary voltage and current to the Peltier module. The voltage and current requirements will depend on the specific Peltier module included in the kit.

Thermal Paste: Often, thermal paste is included to ensure good thermal contact between the Peltier module and the heat sinks, maximizing heat transfer efficiency.

Temperature Controller: Some kits include a temperature controller or thermostat to regulate the cooling system's operation. This allows you to set and maintain a specific temperature for your cooling application.

Wiring and Connectors: The kit provides wires and connectors to connect the Peltier module, heat sinks, and other components to the power supply and temperature controller.

Insulation Material: To improve cooling efficiency, you may find insulation material in the kit. This helps reduce heat transfer from the hot side to the cold side of the Peltier module.

Assembly Instructions: Detailed instructions or a manual guide you through the assembly process, including how to connect components, apply thermal paste, and set up the temperature controller if included.

Safety Precautions: Some kits may also include safety instructions, especially if they involve high currents or voltages. It's essential to follow safety guidelines to avoid accidents.