Features: Experience innovative timekeeping with the LED Electronic timer, featuring gravitate sensors that automatically detects orientation to simulate realistic sand for precise timing. Customize lighting with blue, green, or red LED effects in or dynamic mode, and utilize the PCB design for easy soldering and circuit assembly. Ideal for students and enthusiasts, this educational set provides hands on practice in electronics construction and learning. Enhances desktop decoration, time management, or creative lighting in settings like offices, classrooms, or maker space. The clear ABS case showcases internal electronics, while double power option via USB or battery ensures portability for indoor or outdoor use. Specifications: Component: electronic components +PCB board Size: Approx.10.9x6x3.1cm/4.29x2.36x1.22inch Output voltages:3.7V (battery） Input:DC5V Power Supply:USB+Built in Battery(200mAh) Customizable Countdown Ranges:0-99minute Option Type:blue light with Shell,green light with Shell,red light with Shell,blue light,green light,red light, Function: Timing function ,gravitate induction automatic flipping,welding practice,Desktop decoration, Interesting science Package Includes: 1pc LED Dot Sand Timer note: Please allow 1-3cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.