Features: 1.Sensitive Touch & Automatic Calculation: The hidden sensor copper sheet are a provides sensitive hands touch control. Innovatively added automatic calculation grade design, so that your progress can be seen at a glance. 2.Big Screen Enjoyment: Equipped with 2.5mm external port can be linked to major brand displays and Mobile DCTimer application (the package include the connecting wire). You can share good grades with friends anytime, anywhere. 3.Anti-Slip Design: 6 anti-slip pads are correctly distributed on the back, not easy to slip. You will be happier when you play the puzzle cube with this timer clock. 4.Mini Size & Easy to Carry: 275*75*30mm. Small size for your use, light weight, easy to carry and store. Only need to install 2 AAA batteries to use. (Please note that the package not include the battery). 5.Use Occasions: A great timer for kids or adult game timing tools. Very suitable as competition timer, dice timer, time management tool, desktop timer, timer, training.