Ding Dong!!! Are you looking for a doorbell? Here’s one, the Wireless Doorbell with Flash codenamed HFD-9510×3. It is easy to install, just place the doorbell button outside the door, and the remote chime inside your house. They will work in the distance of 50M to 80M. When the button is pressed, it will rings with 3 colors flash light. No electrical wires need as it is powered by a 12V battery. You can get one for $15.89.