If you're going away on holiday, consider picking up this Dawn To Dusk Sensor Timer; it will add an extra layer of security to your home while you're away by helping your home appear occupied. Simply plug the sensor into your mains plug socket, and then plug a lamp or other light source into the sensor. As night falls, the sensor will automatically turn the light, bringing the impression that you're spending an evening at home. It stays on for four hours during the winter and two in the summer, and all of this is pre-programmed into the sensor. All you have to do is plug-in, and then take off on your holiday, knowing that no passers-by can tell that you're gone.