Femtocell technology provides improved cellular coverage and network capacity. It involves placing small, low-power cellular base stations called femtocells inside homes and offices connected to the internet via broadband. This allows indoor users to connect to the cellular network and offloads traffic from macrocell towers. Femtocells operate at very low power levels within a range of around 200 meters and connect back to the cellular provider's network via an existing broadband internet connection. They provide benefits such as improved coverage, network capacity, and reduced subscriber turnover for cellular providers.