Please read the entire description and check the prices from the dropdown list before placing the order. Most questions are answered here. Listed prices are the unit price for each item. For Example, please enter an order quantity of 3 if your door number is 777. 8" size numbers are the most popular and most cost-effective. Construction: The numbers are engraved in solid Acrylic (a bullet-proof material used for bank windows) or ABS (a widely used material for auto parts), never rusts, and last longer than metals. LED stripes are sealed inside the body channels with translucent plexiglass from the back. Water-tight and weatherproof. They are finished with textured metallic coating / UV protection coating that adds a glossy film on top of the finishing. Due to the density difference, the cut-edge (side of the numbers) of ABS may not be as smooth as the acrylics. Installation: Each number is pre-installed with 1/4" size anchors on the back. Trace the anchor locations on a piece of paper and mark them on the wall. Drill 1/4" holes on the wall to receive the anchors. You may Keep the numbers a short distance from the wall to allow more light exposed from the back. Electrical Connections: 12" to 20" long lead wires (vary by the size of the numbers) come out from the back. Most people drill a thru-hole for each number to connect the lead wires from the back of the wall. Connect all numbers with the same wire colors. You may lay the lead wires on the front wall and paint them the same color as the wall to avoid drilling extra holes. A free plug-type 110-240V power adapter is provided for each order. You can use your timer (like the Xmas lighting control timer) with the plug-type adapter to set up the numbers on/off automatically. Other power adapters such as Wiring type (wiring to the home line), Low-voltage type (connecting to 12-28V low-voltage yard line or the old doorbell transformer), or Solar power are available to order from the dropdown list. No matter how many digits your door number is, only one power adapter is needed per mount location. If you order a dusk/dawn switch, it will be preinstalled in one of the numbers. 6" size numbers do not have enough space to accommodate the dusk/dawn device inside the numbers. Instead, an external dusk/dawn switch will be provided and prewired for 6" size numbers at the same cost. Only one dusk/dawn switch is needed per mount location (no matter how many digits of the door numbers). The solar power comes with a remote controller and built-in dusk/dawn switch so you do not need to order an additional dusk/dawn switch if you select the solar power option. Solar-powered LED is not recommended unless other power options are not available at the mounting location (such as a mailbox far away from the house). The output of solar panels varies by the weather. Referring to the listing pictures, please leave us a note of your preferences before checking out: 1) the door number, 2) the font type, 3) the LED color, and 4) the finishing color. If you do not specify or answer our reminder message, the order has to be canceled. You are welcome to replace the order at any time. Please don't hesitate to contact us should you have any special requirements, such as a color/font/size not listed here. Product Warranty: One year of free replacement, and three years of free repair under normal wear and tear. Customized products are not resellable, return is NOT acceptable. We try our best to provide quality products at affordable costs. Minor tool-handling marks may exist on the side or back, which are not noticeable from 3 feet away. Your understanding is highly appreciated.