The 16 amp - 240v Mains Unit Coupler is the 'female' end that would effectively be live if the other end of the lead was plugged into the site power supply.
Many camping goods depend upon power. As more and more items such as freezers have become essentials for many tents, camping accessories such as this one have become more important. After all, the last thing you want is to arrive at the site and then have no way to rig up your fridge or lamp!
