The motor discs have two wires for power (red is positive, black is GND) and can be powered from as little as 2V and up to 5V. The higher the voltage, the more BUZZ (but you'll use more current too). Current can be limited with a resistor too.
10mm x 2.7mm
5V current draw: 100mA, 4V current draw: 80mA, 3V current draw: 60mA, 2V current draw: 40mA
Weight: <1 gram
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