The Velleman MK149 DIY minikit will test your love level and compatibility with a partner. The circuit is complete when each person holds one side of the PCB and then holds hands. The ten LEDs form a flashing love meter and the kit is compete with buzzer. The electronic circuit’s sensitivity ranges from cool to steaming hot. The DIY kit is a fun gadget for parties. It’s low power and operates from a 9V battery and includes a power switch.