Smart Magnetic Countdown LED Digital Timer

[Easy to use and Intelligent battery saving] Twist One Button Operation DSo simple that elderly grandma and 5-year-old kids can use it easily. Siliver knob and Black body. Twist the knob to set the time, press ⊙ to start or stop .The digital light will be darken in 5 seconds and shutdown in another 5 seconds, which can last battery life. [Magnetic&Time management] With magent on the back , you can stick to classroom whiteboard, cooker, task, students tablet, iron wall, fridge, sports gym or other steel place. [Large LED Display and Constant Bright Function] 3 inch Large screen with Constant Bright Function. The Constant Bright digits make it easy to read at a long distance. Even in big meeting room, classroom ,or big kitchen, exercise room.