Arlec Smart 2.1A USB Charger Plug
Model reference: PC389HA
Configuration (old version)
Tuya-Convert might not be possible for this device since the template was added (2020-05-03). All new Tuya devices have firmware preventing flash but it is still possible to Tuya-Convert old stock devices without connecting them to the Tuya app.
Use Tuya Convert 2. This configuration will give you a Blue LED on the switch when on, nothing when off.