Octopus Electronic Bricks you can use them build electronics projects just as easy as piling bricks. By using Octopus electronic bricks you may connect Arduino/Freaduino compatible boards easily with various digital analog and I2C/Uart interfaces. These the breadboard-less firm connection are prepared to extensive modules like poteniometers sensors relays servos even buttons just plug and play. Octopus Passive buzzer Brick is based on an active buzzer can not by PWM to control the volume. The volume is constant. And passive distinction is the buzzer posted sign - Power supply needs: 5V - Interface type: Analog - Pin Definition: S-Sigal V-VCC G-GND - Wide detecting scope - Fast response and High sensitivity - Simple drive circuit - Stable and long life - Size: 19 x 27mm