Electronic Combination Lock

This is one of Tim's home made toys. The orange flashing light has been hooked up to an electronic combination lock. You can simply use the ON switch to operate the light, or you can use the combination lock. These are often found on safes, and require a series of numbers to be set in sequence, but can also involve instructions to rotate the dial either clockwise or anticlockwise, and sometimes you need to make 2 or 3 complete turns of the dial, before setting the next number. After all that effort, Tim manages to switch the light on... the hard way!