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A reed switch is an electromagnetic switch used to control the flow of electricity in a circuit. They are made from two or more ferrous reeds encased within a small glass tube-like envelope, which become magnetised and move together or separate when a magnetic field is moved towards the switch.
A push-button is a simple switch mechanism for controlling some aspect of a machine or a process. It completes an electric circuit when you press on it. When it’s on, a small metal spring inside makes contact with two wires, allowing electricity to flow.
A 6 Pin Push Switch also known as Mini DPDT Push Switch, is nothing but a combination of two push switches placed together inside one package. Unlike momentary switches which connect the wires of the switch only for a second, this switch retains its ON-OFF state till pushed later on. For example, if I push it once so that it’s turned on, it will remain in ON state till it’s pushed again. That’s why this switch is useful in controlling power connections most of the time.
LM393 Microphone Amplifier 
Arduino UNO R3 Dip WITH CABLE 
Analog/Digital LDR Module 
