This small vibrator motor can vibrate like your phone. When using it, You only need to power for the module and then send "Vibration" command. In fact, The "Vibration" command is setting control pins to high level, then it will work. I like this module because it can creat a short-term shock to prompt me whether one operation was successful, such as shaking my arm to switch my iPhone songs, which sound terrible, and it is not like the buzzer which sound terrible.
Xadow is a though small but perfectly formed Arduino(TM) compatible board series containing several modules. It's a kit extremely suitable for space-sensitive projects such as wearable devices & arts designs, which have higher request on size, weight and flexible cascade connection.
You can find more modules here.