Running on a reliable 3.7 volt lithium polymer battery generates quite a bit of vibration! Very high speed! What do I use them for? Individual crafts for adults. What they actually need is a resistor, a potentiometer, or something that will make them produce a nicer vibration. I think if your project involves a less intimate use of these things they would be perfect. Very small, very fast and can be operated over a wide range of DC voltages. Good price for many of them!
MIDI keyboard Axelvox KEY49j white
22 Review
5Pcs 19Mm 12V 24V Waterproof Latching Push Button Switch With Wiring Harness And LED Indicator Light, Pre-Wired SPDT Self-Locking 4 Pin Marine Metal Switch For Boats Cars Trucks (Blue)
22 Review
Universal Rotary Cam Selector Latching Switches - VictorsHome Changeover Switch LW28-32 With 3 Positions, 12 Terminals For 690V, 32A Capacity
9 Review
TWTADE/AC 24V 10A Coil Electromagnetic Power Relay 8 Pins 2DPT 2NO+2NC With Indicator Light And Socket Base -YJ2N-LY
9 Review