If the unit is run on the 'DRY' (dehumidifier) setting, the Owner's Manual says to attach a drain hose if the unit is run on a constant basis. If the unit is run in the 'COOL' mode (air conditioner), the moisture is vented right out the window.
In any event, the unit is equipped with a 0.5 Liter (or maybe a 1 Liter) internal reservoir to catch condensation; the reservoir is VERY easily drained through a port on the rear; the port is small, so it drains a bit slower to prevent a deluge of water pouring out (I drain it using a 2 Liter soda bottle to catch the condensation). FYI, if the reservoir becomes filled, the unit automatically shuts off, and displays 'FL' (full) on the digital display.