The module can accomplish ultra long distance transmission of data, that is, it can provide ultra long range spread spectrum communication and high anti-interference. It also has the function of transmitting data through the wall.
ESP-WROOM-32 is a powerful, generic Wi-Fi+BT+BLE MCU module that targets a wide variety of applications, ranging from low-power sensor networks to the most demanding tasks, such as voice encoding, music streaming and MP3 decoding.
The Leonard GPRS/GSM is an integrated board which based on the Leonardo. It composed of SIM800C, Leonardo, relay switches and so on. So it can be applied to remote control industrial motor, smart home and remote control locks.