one of very amazing and interesting switch. it can be used on a high standard hotel. come to think of it. if you are one of there employee and you forgot to switch off the light of fourth floor but you already on the ground floor don't think it would be the problem because you can switch on or off the light in any floor by the use of this circuit. and by the way electronics is awesome and also i made this by the help of my own knowledge in electronics.
