This rechargeable Meaco Mini-D dehumidifier is a great little unit. It contains silica gel which absorbs moisture from the air. Place upright on a flat surface and do not cover.
When the silca gel in the window is orange the dehumidifier is fully charged, when the silica turns green the unit needs recharging. Connection to the mains is only required whilst recharging. A metal plate inside the dehumidifier warms the silica gel to dry it out. Therefore unit will become warm whilst plugged in to the mains.
Ensure that the unit is upright whilst recharging.