ESP32-M1 Reach Out: Open hardware ESP32-M1 development board, Wi-Fi range up to 1.2 kilometers (schematic, etc.)

ESP32-M1 Reach Out combines everything you love about ESP32 modules with everything we know about long-range Wi-Fi communications. There are very few development boards on the market for high-power Wi-Fi radios, and almost all of them max out at 20 dBm transmit power. The ESP32-M1 Reach Out is capable of transmitting at 30 dBm (1 W) while drawing power from a USB 3.0 port on a laptop or power bank.

US regulations for ISM band communications equipment (per FCC 15.247) allow EIRP (effective isotropically radiated power) up to 36 dBm (4 W) for point-to-multipoint links and even higher for point-to-point links. The ESP32-M1 Reach Out's 30 dBm (1W) conducted power also allows use in certain European, Asian, South and North American countries, and New Zealand. If you are subject to restrictions in other jurisdictions, you can adjust the board's transmit power via the ESP32 module, or reduce it further using the onboard RF attenuator.