3 pack – 4 white 1x4 bricks/white led down lights in a series (four in one down lights), usb powered – 100% compatible with lego bricks brick loot you asked for 1x4 down lights ... and we made them! this is a fantastic custom way to light up your brick sets or mocs. attach the 1x4 bricks to the ceiling of your build and plug the usb plug into the usb port of a battery bank, charger, or even your computer. the bricks are 100% compatible with other major brand bricks. the wires are thin yet strong and designed to go between the studs. if you place a wire on top of a stud and then put a brick on it you will cut the wire -- so just remember to put them between and you will be good to go :)