Instruction for battery change:1. Pull out the vibrator from the gap in between the bullet head;2. From the slot in the middle the of bullet head, twist and open;3. Remove the old batteries (2 LR41 are required, included), insert  new batteries and replace and tighten the slot. Gentle Reminder:Dancing Finger is simple to use with just one button switch located on the top of the vibrator.Packaging: 1 pcs