It is a small built-in vibration motor Module. After input 5V current, you can control the ON / OFF or vibration intensity of the motor By digital signal or PWM signal.
The 2SA684, 2SA684-AP–Bipolar (BJT) Transistor PNP 50V 1A 200MHz 750mW Through Hole TO-92L. Pricing and Availability on 5000 almost of electronic components from BD-SpeedyTech.
This is an Active buzzer is present inside with shock source, so as long as the electricity will call 2 Program control convenient, single chip microcomputer a high and low level can make the sound, and the passive buzzer is can not do.