1. Download the BlitzWolf app on your phone, be it Android or IOS and select the "Add Devices" button in the top right corner.
2. Power up the BW-SS4.
3. Press and hold the reset button on the BW-SS4 for 5 seconds
4. Add a new device by swiping to the + in the top right corner and select the SMART wall switch.
5. Select and enter the password for your home wireless network.
6. Rename the device so that if you have multiple smart home devices, you can easily recognize it.
7. Press the "Done" button and schedule or make rules as needed to work with your other devices.
It also works with Google Assistant and Amazon Alexa. Its use is almost infinite. Here's a Google Smart home tutorial