This is a mechanical drive timer. No battery needed, practical & economical design. How to use 1. At first, Rotate clockwise to the end (60minute point). 2. Then If you want to timer like 5 minutes long. Just rotate in counterclockwise direction to the 5 minutes point. 3. When time's up, it rings automatically. Kindly tips For avoiding damage the built-in movement, Please do not overdrive when rotating to the end. Package include 1 x Ice Bottle Kitchen Timer