3.3V-5V Active Buzzer Alarm Beeper Module High Level Trigger Buzzer Control Sound Module Alarm Electronic for Electronic Toys
 
A module using 9012 transistor drive
2 Operating voltage 3.3V-5V
6 with fixed bolt hole for easy installation
7 small plates size: 3.3cm * 1.3cm
Two module interface specification (3-wire)
1 external 3.3V-5V voltage (5v microcontroller and can be directly connected to 3.3v MCU)
External GND 2 GND
3 I / O external microcontroller IO port