HomeGUARD + Plus White. Safety device by HomeGUARD specifically designed to protect homes against potentially damaging products that can enter the premises by being inserted through the letter box such as fireworks & liquids. An added feature of the HomeGUARD Plus is the integrated fire extinguisher which will automatically extinguish flames the moment significant heat is detected. The HomeGUARD Plus will also protect mail against unwanted attention from inside the house, such as that of dogs and small children.. Large capacity. Easy to install. Lockable letter plate. Fire & leak-proof bag