Built to last. Mechanical timekeeping products do not require batteries. Practical Cookware: Egg cookers are great for cooking food and keeping cookies, cakes, grills and casseroles from burning. Perfect for waking up from a nap and protecting you from deep sleep. Time setting range: The time can be set arbitrarily within 0-60 minutes. Can operate without batteries, automatic federal weapons. If you switch to a mechanically driven time setting, the doorbell will automatically ring. How to use: Set the timer to 55 minutes, then turn it counterclockwise to the desired time, eg B. 20 minutes. The timer will turn off after 20 minutes. Do not use excessive force or repeated rotation when tightening, so as not to damage the built-in movement. TIME MANAGEMENT: Great for kitchen timers, workout timers, egg timers, homework timers, time blocks, debate or competition timers. Size: 6.5x8.7cm Material: ABS white color Delivery Quantity: 1 Piece Note: Manual measurement, there may be an error of 1-2cm/1-3g, which is not a quality problem. Due to different screen displays, there may be a color difference between the real object and the picture.