4M Toysmith, Logiblocs E-Building Blocks System Secret Recorder Kids Science Kit

Build over 10 custom circuit systems using logiblocs secret recorder kit Plug-and-play electronic building blocks, Each color coded with unique functions to create custom Circuits to build a variety of control systems and gadgets Kit includes Essential blocks to build a wide variety of spy gadgets like a door chime, surprise message box and Ghost fridge Recommended for age 5 years and up; requires three AAA batteries (not included) Logiblocs kits to create almost endless combinations of custom systems and gadgets