Cel-Fi PRO / DUO+ Canada cell phone signal booster kits are plug and play. They require no complex installation process. No need to get on the ladder to install exterior antenna on outside wall or roof of your home, or office building. They consist of two small handheld units whereby you place one unit near a window or wherever there's best signal and plug its power cord to an electrical outlet. Then you place the other unit farthest away and the whole space in between will have great cell signal. These work only for one Carrier so you must choose one of these easy install cellular amplifiers designed for your carrier (see below to pick). If you need for more Carriers, you will have to buy multiple kits accordingly.