4M - Doorbell Making Kit
Learn about electromagnetism and transform a metal screw into a magnetic hammer. Complete an electric circuit with it to construct this handy doorbell. Use it in your room as a cool science gadget.
Contains a base board, bell, coil cover, L-shaped cover, battery cover, hammer, coil, adjuster holder, hammer holder, washer screw, screws, adjuster, wire with metal ring, long screw and nut, terminal caps and detailed instructions.
Requires 2 x 1.5V AA battery (not included)
Doorbell Length (approx): 16.5cm
Ages: 5+
RETURNS
FAULTY PRODUCTS