The Micro+ Battery vibrates for a number of reasons. First, the unit will vibrate when turned on or off. When the Micro+ is being used, the battery will vibrate to indicate that the tank has reached the desired temperature and is ready to be drawn from.
If you have any further inquiries, please contact our Customer Service Department anytime Monday through Friday, 8:00am to 5:00pm PST.
Phone: (800) 948-7480