A vibration motor! This vibratory little buzzing Disc motor, is perfect for non-audible indicators and for any haptic feedback project. These vibe motors are tiny discs, completely sealed up so they're easy to use and embed. Use in any number of applications to indicate to the wearer when a status has changed. All moving parts are protected within the housing. With a 2-5V operating range, these units shake crazily. Once anchored to a PCB or within a pocket, the unit vibrates softly but noticeably. This high quality unit comes with a 3M adhesive backing and reinforced connection wires.Two wires are used to control/power the vibe. Simply provide power from a battery or microcontroller pin (red is positive, black is negative) and it will buzz away. Higher voltages result in more current draw but also a stronger vibration. You can reduce the current draw/strength by adding a resistor (100 to 1000 ohms) in series.