There are some reported light switch issues. The original design was intended to use with IoT Relay Switch on Amazon. But it was out of stock at that time for a half year. So we supplied our own.
But going forward, we are not going to supply the light switch anymore, as we felt IoT Relay Switch was a better option.
Here is how to convert to use IoT Relay Switch
Open the light switch box. Disconnect the Red-Black-Yellow wires. Unscrew the connector cap and take out the signal wire.
Remove the connector from IotRelay
Connect only Red (Right) and Black (Left) and cap/tape the Yellow wire.
Here is the testing video