60-Minute timer, 100% mechanical(No batteries needed). Tomato shape, Material: plastic. We have two sizes: Small: 2.4"L x 1.7"H, Large: 2.8"L x 2.1"H. It is easy to use. Step1: Turn clockwise to "55"(From "0" to "5", untill "55"), but do not exceed "0"; Step 2: Turn anti-clockwise to any time(From "55" to the time you need). it will make a loud ring when the countdown ends. The timer will also be great gift for your friends who need time reminding.