I'm not well versed in electrical engineering, but I was looking at this. http://www.precisionmicrodrives.com/vibrating-vibrator-vibration-motors/pager-motors-erm-motors It suits my needs for a project, but I need to modify some aspects of it. In layman's terms, can someone explain to me how I can make it vibrate at certain frequencies? Also, from my understanding, it runs when a current is run through it. Can it be run on a rechargeable battery, if so, how would I make the necessary modifications?