Although these heaters are designed for outdoor installation and use, it is important that the wireless remote control(s) be protected from the weather. Should the remote control become wet, it may be necessary to replace the control. Keep controls out of reach of children. Each control has four buttons (ON OFF HI LOW). The remote controls are powered by batteries. The remote control has an approximate 25 foot line of sight range. Weak batteries can limit the effective range of operation.