[Portable Use]Start the timer by long-pressing the power button. The timer will automatically display the preset time facing upwards and begin the countdown. This polyhedron desk efficiency timer is simple, compact, and easy to carry. You can place it in your pocket, backpack, or handbag for use anytime, anywhere. [Various preset times]The 12-sided timer features 11 preset countdown durations (in minutes: 5, 10, 15, 20, 25, 30, 35, 40, 45, 60, 90). With a simple flip, the timer starts in just one second. [Perfect Time Manager]The 12-sided timer is the perfect time management tool, designed to help you stay focused on any task at hand, whether it's studying, writing, boosting productivity, cooking, boiling eggs, baking, exercising, homework, or classroom activities for kids. It's an ideal companion for any scenario where precise time management is essential. [3 modes]This product offers three alert modes: sound, vibrations, and silent. When flipped with the digital side facing up, it starts the countdown, and the display flashes (allowing you to switch to another duration within 5 seconds). After 5 seconds, the flashing stops, and the duration can no longer be changed. Color: Black Material: ABS Specification: Package Contents: 1 timer 1 charging cable