ESP8285 ESP M2

At most case, ESP-M2 is similar to ESP-M1. So, many usages and applications can be referred to ESP-M1. Just the ESP-M1 has the onboard antenna. And the size is different. ESP-M2 is shown in the following.

The user manual can be downloaded from this link.

Now, this board can be ordered at many online shops, like Aliexpress, SmartArduino and banggood.