Versonel is here to answer your questions!
Is it waterproof?
Yes, it is waterproof but the linked manual in the features also says not to immerse it in water.
Cheaper at street smart protection and free shipping.
Is the device compatible with synology surveillance station?
I have an older version of this (Non Wifi), it works shocking well. The LED setup is nice and bright. The head swivels quickly. The video and audio recording work fine.
Mine is on 24 hours a day, and so far hasn’t been effected by rain or wind. Waiting to see how winter treats it,