HiLetgo ESP8266 Serial WIFI Wireless Module ESP-07 Wireless Module RF chipESP8266EX. Frequency Range2.4GHz~2.5GHz2400MHz~2483.5MHz;Communication distance100m. Wake up within 2 seconds, connect and pass the data packet. Built-in Tensilica L106 ultra-low-power 32-bit micro-MCU with 16-bit streamlined mode, clocked at 80MHz and 160MHz, support for RTOS. Built-in TR switch,balun,LNA,power amplifier and matching network.