4Buttons remote control 1. 4 buttons, 4 keys 2.Control rolling door, window,fireplace, security alarm system 3.Factory sell RF Remote SystemProducts Name4 Bottons Remote ControllerModel NoRFU28TypeWirelessFrequency303 ... more than 10 years developing experiences;3. RF remote control , RF receiver control kit and IR multifunctional remote control; 4. New models according to customers requirements ...