The timer has a built-in mute chip, which makes it perfect compatible with use in libraries, classrooms, and other public places that require a quiet environment. Innovative realization of 3 or 30 seconds reminder mode selectable function, support mute or reminder mode free switching, adapt to different occasions needs. With a low battery flashing light reminder function, convenient compatible with users to replace the battery in time. Specially designed compatible with children and students to learn, with a manual visual operation function, to meet the needs of classroom learning, homework management, exam training, and other scenarios. It helps to cultivate children/x27;s concept of time from childhood, helps self-discipline learning, and improves efficiency, but also small and portable, realize the combination of work and leisure, is the practical tool to improve the quality of learning. Features: /Premium Material/: Adopting thickened frosted surface housing design, with a knob dial and thickened dial sheet, wear resistance and with high stability. Equipped with a thickened flat lens and protective film, high transparency, high toughness, and anti-scratch, to ensure that the device can be used compatible with a long time without damage. /Fall-proof Silicone Cover/: Drop-proof design, equipped with drop-proof frosted surface silicone cover, high tear resistance, high resilience, and thermal stability, with nice drop-proof performance of 3 meters drop without damage, ensuring reliable use in various environments. /Built-in Mute Chip/: The device has a built-in mute chip, which means that the device can maintain stable operation even in a low-power state, ensuring accurate timekeeping. Additionally, the silent design of the device makes it perfect compatible with use in libraries, classrooms, and other public places that require a quiet environment. /Humanized Function Setting/: Innovative realization of 3 or 30 seconds reminder mode selectable function, support mute or reminder mode free switching, adapt to different occasions needs. With a low battery flashing light reminder function, convenient compatible with users to replace the battery in time. /Professional Customized Design / Widely Used/: The timer is specially designed compatible with children and students to learn, with a