The WireFree™ Solar Pack includes the 11.85- by 1.57- by .43-inch photovoltaic panel. Mounted on the inside of the window opening, it converts sunlight into electrical energy, which is stored in the 13-inch long nickel metal hydride battery to power any Somfy WireFree™ motorized window covering. The pack also includes the Y harness connection wire and mounting tape. Accessories are available, such as a solar panel mounting bracket kit, a plug-in AC battery rapid charger (required for charging battery prior to installation) and extension cables. Somfy Systems. www.somfypro.com.