Step 1: Taking a Collar Off a Pet.
Step 2: Assembling the Circuit.
Here one may say i am not using the 3v as the battery doesn't last long so i am doing by adding a 9V battery as it has longer life and this is the voltage the IC can handle normally and the IC can work with full potential.
But be sure to add a resistant on the anode of the LED as it may burn out the LED.
I have given the picture below.