High quality materials: High quality ABS material, non-toxic and tasteless, durable. Mechanical timing products do not require batteries. Practical kitchen helpers: The hourglass is very suitable for cooking food and can prevent cookies, cakes, roasts and casseroles from burning. The ideal choice is to wake up from a nap, which can protect you from deep sleep. Time setting range: You can set the time as scheduled within 0-60 minutes. Can work without battery. If you switch to mechanical drive time setting, the doorbell will ring automatically. Time management: This bear timer is beautifully designed, can effectively manage your cooking time, and is a good helper for your kitchen. Instructions: 1. Zero the scale before use (do not rotate counterclockwise); 2. Rotate clockwise to the 55 scale (must be rotated to 55 minutes first); 3. Then turn it anti-clockwise to the desired time, for example 20 minutes. Then the timer will ring after 20 minutes. Wide range of use: Very suitable for kitchen timers, sports timers, egg timers, homework timers, time blocks, debate or competition timers. Scope of delivery: One piece