How is sound activated and triggered recording work?

I'm thinking of getting a surveillance camera. probably recording Sound activated. How strong is it has to be sound. For example, if only it was someone moving on the start recording when the sound has to be stronger. On the other hand, would be passing cars outside the house to activate the recording.

The microphone heard constantly and when the volume reaches dB predetermined level begins recording. Generally, you can set the level of what you want. Motion sensor can be a trigger for better surveillance camera.

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The Clapper Sound Activated On/Off Switch, 1 Each $15.54 Clap On! Clap Off! - The Sound Activated On/Off Switch.2 Claps turn on the lamp - 3 Claps turn on the TVThe Clapper Can Control One Or Two Appliances At The Same Time.Set the dial to Home or Away. Connect your appliance(s) into The Clapper. Plug The Clapper into any standard wall outlet.Special Features:Clap Detections Lights - Lights glow in sequence when proper claps are detected. Sound Sensitiv...

The Clapper Plus Sound Activated On/Off Switch, 1 Each $20.99 Turn on or off your appliances with a remote control or by clapping your hands.Use the handy remote. . . to light a dark stairwell, as you enter a room, or before you enter your home.Clap or use the remote control to turn on or off. . . Lamps, Christmas tree lights. Also great for: Fans, Radios, Lights in the baby's room, Hard-to-Reach appliances.Turn on or off up to 2 different appliances with a ...

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