This is a suction cup with a wide (150mm diameter) base and a unique pump-action mode. To attach it you simply hold it in place and pump the blue button several times until you can no longer see the red line. It will now safely support a load of up to 3kg. If the red line becomes visible again simply re-pump. We stuck one to a whiteboard in the office couldn’t shift it no matter how hard we tried. It wasn’t until the end of the day that the red line began to appear again. Its ideal for fixing to windows, car windscreens, bodywork and er whiteboards.