TIME MANAGEMENT: The maximum time is 99 minutes and 59 seconds, which perfectly meets the needs of classroom and after-school activities, and provides an excellent countdown/countdown timer for teachers' children. LARGE SIZE: 5.5*3.4 in.Weight: 95g (including battery).Automatic sleep functionIt can also be closed manually, two years of use.Very light,Easy to put in Pockets,Bags. BIG DISPLAY: Large button,candy color. Large LCD screen, 12-digit display, vertical back, 15-degree angle for easy-to-read calculator. One AAA battery is included in the package APPLICATION SCENARIO: Made of durable ABS material. Yellow-white, pink-white, orange-white, pure white, pure green, a variety of fashion styles. Small and portable general purpose desktop calculator for home, school, office or shop, can do common math like we do Has a variety of financial functions, great for adults and students DURABLE SILICONE KEYS: Good feel, ABS plastic material, light weight. Reasonable configuration, comfortable operation, automatic shutdown, independent memory.Anti-slip design, with anti-slip washers, it is not easy to slide during operation.