I bought a bunch of components including these connectors in order to add lights to my modular building (didn’t want to buy the pre-made kit, wanted to DIY it) Follow the instructional videos on YouTube made setup a breeze. These pieces are awesome! I’m now able to take my modular buildings apart and have the lights still work, which is amazing. Other light kits have wires connecting the different boards so the buildings cannot be taken apart. Or, on other sites, the wireless connectors cost way more. These ones on game of bricks are a great deal. Definitely worth the purchase!