Environmentally friendly desk calendar design instead of paper waste, it can be reused as long as the adjusted monthly to ten-thousand years; Calendar is easy to use, like a stack of building blocks, piled from low to high. Every building blocks can change in accordance with your wishes, you can also use a special marker to mark the special day, when you arrange the appointments of the day, with icons instead of the more eye-catching, do it yourself. At the bottom of the building blocks module features 4 USB HUB. Quality electronic devices to ensure stable operation. The computer automatically recognises the installation, no drivers, plug-and-play. FeaturesAdjusted monthly Calendar. Never buy a calendar again! Expand your computers connectivity with this 4-port USB HubCapable enough to meet your connectivity needsCompatible with ANY multiple USB devicesNo external power supply requiredDurable and lightweightEasy to useSuitable for flash drive, digital camera, DV, audio devices, monitor, input devices, etc. Specification: Material: PlasticDimension (LxWxH): 12 x 3 x 9.5cm