Durability: The best dog talking buttons need to be durable. Look for ones made of heavy-duty plastic that are easy to wipe clean. Because some dogs prefer to push buttons with their noses ...

When pin 2 of the LM555 is triggered (by shorting it to ground) through the momentary switch S1 ... LED1 indicates the circuit is powered ON. An SPDT switch S3 is used to switch the circuit ON.