The Doorbell from Aeotec is a two piece package: An 80Db speaker for inside your home, along with a wireless button for outside of it. Both LED lights and tones will alert you to someone being at your door. Personalize your doorbell with up to 100 different tones. Doorbell is easy to install. Its speaker simply plugs into a power outlet, and its button can be easily installed beside your front door with double-sided tape or small screws.