[BK7231N/BL0937] Teardown Generic 16A Dual EU Wifi Smart Plug with Energy Measurement

I ordered a dual smart plug from AliExpress in January 2025 (seller: Fairylink Smart Home Life Store). The cost was around 14 Euros with VAT and shipping.


I expected something similar to the Kruidvat SMART Dual Plug. What arrived however was much different.

Unboxing photos:


Teardown photos:


The relays are much smaller than the Kruidvat. I am not sure I would trust this with 16A.

The plug is using the CB2S module, however the silk screen is reversed on the back of the module. I desoldered the module to flash because it would not work in circuit, although to program it I had to go even farther and short CEN to GND before it would enter flashing mode. It's possible you do not need to desolder the module if you short CEN in circuit.



Since I could not find another thread for a similar plug, here is the configuration I found:


The BL0937 requires calibration after flashing, similar to other plugs.

Thank you for sharing. It's nice that the manufacturer kept the pad labels on the main board.

I'll just write down the main board label: FL-S181-V1.2 , so others can find this topic more easily.

Added after 4 [hours] 30 [minutes]:

Added to devices list:
https://github.com/OpenBekenIOT/webapp/commit/b6d023fe4d18c45fe55cd049d55c4e60870c9e44