The MS-190 Mini Motor Siren 220Vac is a compact, high-decibel industrial alarm that produces a loud, piercing sound similar to an electric drill by using a motor-driven windscrew mechanism
Signal Generator PWM Pulse Frequency Duty Cycle Adjustable Module, 3 Channel, 1:150Khz, 3.3:30 V DC. An electronic module identified by its model and function.