Please note: The FAKWRS1 doesn't come with a wireless rain sensor. For this extra feature, please see: FAKWRS2 Description Quick and easy to install either at the time of window installation or as a DIY retrofit, the FAKWRS1 is a solar powered control unit which uses solar energy to charge the system's batteries. The batteries will also recharge in daylight and use stored energy to operate in overcast conditions or at night. Fakro offers options for both single and multiple window operation. This system can also be used as part of Fakro's Smart Home technology. The system is operated using a remote control, which has a range of up to 100m. When closed, the window has a opening resistance of 150kg. All brackets and fittings needed for installation come included