The device is of good quality with well-designed and built-in functionalities. What is missing is the ability to easily use unused (except i2c) gpio's of esp8266 module (eg soldering holes or connectors for external devices sach as sensors, etc.). With this simple addition the device would become more usable. Shipping via LV post to BA is OK but can be cheaper (8 USD).
Great function and nice finish. Easy to use, which is probably why it came without documentation. The blue LEDs are very powerful, so I replaced the resistors to lower their intensity. Other than that, highly recommended.