Features: Mechanical clockwork design makes it work without battery, it is environmentally friendly and could work longer. Magnets on the back for adsorption on iron-containing objects such as refrigerators and microwave ovens. You do have to turn the dial all the way clockwise and then back counter clockwise to the for time that you want in order for the alarm to go off. Sturdy and textured,retro mechanical timer,exquisite appearance,a variety of colors can be choose. There are 3 visual colors, reen/red/orange, you can select based on your need. Specifications: Material: Plastic Size: 7.3x7.3cm/2.9x2.9 Inches Color: reen/red/orange Package Includes: 1x Mechanical Timber note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.