Create over 75 cool electronic projects with this Elenco's kids science lab for older children. The Electronic Project Lab 75 in 1 Science Kit comes with easy to follow illustrated lab-style instructions that explains how to conduct the experiments and the principles of physics behind them. With this electronic science kit older kids can build motion detector, water level alarm, burglar alarm, electronic organ, two stage timer sound, voltage detector, logic tester, electronic coin toss, sound level meter, optical volume and much; much more. Electronic Project Lab 75 in 1 Science Kit offers spring hook-up method to connect the electronic parts. This multiple project electronic science lab requires 4 AA batteries (not included).