I estimate 10-12m. In any case, much further and much better than the Cam2. I don't regret buying this S3 as a replacement for the S2.

They work on the 2.4 WiFi Band so quite far. This is my second set after replacing my older 2k WiFi cams. I love them because they are WiFi sonowires, very easy to setup and install. No extra cloud storage costs and these new S3 Pro have amazing nightime colour option that works really well. The battery in my old Eufy cams easily lasted one year before recharging was required. These are still new but after one month the battery is still at 90%.