Sensor-Arduino Active Buzzer:

• The Keyes KY-012 Active Buzzer Module is compatible with Arduino, and produces a single-tone sound when the incoming signal is high.
• The KY-012 Active Buzzer Module is an excellent option if you're searching for a straightforward yet efficient solution to include audio in an electronics or Arduino project.
• Its basic function is to just emit a single tone sound when the incoming signal is high.
• In order to create a custom alarm or detection system that can emit an audio signal upon receiving the electronic high signal from the Arduino controller board, this enables single-pin operation on an Arduino Board.