OVERVIEW This module is extremely simple to use, and is an awesome little buzzer. See the You Tube video to get an idea of how loud this buzzer is. Simply send it HIGH value on the middle pin to "Buzz" or LOW value to stop it "buzzing" You can change the pitch of the buzzer by changing the frequency of the HIGH value. SPECIFICATION 3.3 to 5V Active Buzzer Alarm Module 3 Pin TTL Cable Transistor drive module uses 8550 Operating voltage 3.3V-5V Drive frequency: 2K ~ 5K square wave Bolt hole mounting 2.6mm aperture PCB Dimensions: 28.2mm (length) * 13.1mm (W) * 11.5mm (H) Wire length: 20cm Weight:. 7g
