Yes, there is an app from mydlink - tracking is also possible over 2 weeks.

According to our research, yes, this product requires an internet connection to work.

The webcam works perfectly for me with WLAN. I cannot judge whether devolo works.

Spotlights and sound can be live image manually switched on and off in the live image.

According to our information, the power supply unit including the mains plug is included in the scope of delivery.

I have this camera with the latest firmware and it works fine with Synology. However, you first have to connect it to the Wi-Fi with the D-Link app before you can add it to Surveillance Station. After that, you can remove it from the app.

As a rule, you can connect and control several network cameras via an app. But I don't think more than four. If you connect them via Wi-Fi, it should be no problem to view them abroad. With a bit of luck, someone else will answer your question, I hope I could help!