1.5/8W.433Mhz;Wireless rf transmitter 2 ,The range is 2-20KM ... user doesnt need to prepare excessive programs Even for semi duplex communication, the user doesnt need ... frequency integrated circuit and single chip MCU are used for lessened peripheral circuits, high reliability, and low failure ... point to multi-point wireless network for longer distance range to 20KM,Wireless transparent rf transmitter