Peltier Thermo-Electric Cooler Module+Heatsink Assembly - 12V 5A _MAKE_COMP there is a PCB with

there is a PCB with a set of dual IDC connectors (one input

2mm mounting holes 2

Matrices like these are 'multiplexed' - so to control all the seven-segment LEDs you need 14 pins

they are essential

Peltier Thermo-Electric Cooler Module+Heatsink Assembly - 12V 5A _MAKE_COMP there is a PCB withThe Peltier Cooling Assembly comes ready to use with a pre mounted thermoelectric cooler, heatsink, and fan, providing rapid cooling for electronics experiments, temperature control projects, and other applications that need a compact cold plate. This is for people who just want to get cold fast. The 12V Peltier module is mounted onto a 12V heatsink and fan assembly with thermal paste and an aluminium clamp. Simply connect to 12V 5A+ power supply and