I have several manufacturer's wifi cams and USB security cams.
1) make sure the cam has full dynamic light range. SOme do not and do not tell you. Get one for indoor / outdoor (through the window) if not actually outside.
2) look at Lorex WiFi. some have medium 640 and other 1024 resolution. caveat - can use WPS to set up. you could set up at your home then ship and do WPS install (that is all you need is push WPS on the ROuter and WPS on the cam and you are done). too many cam options to talk about here. indoor only models will work in room or looking out the window make sure the WiFi router is close to the camera. Also, and most important, make sure the internet service upload speed is sufficient otherwise you will get no connects and/or poor connections that will drive you up the wall. You can change the data transmission rate but you still need really good internet upload speed. I originall had the standard internet install and nothing but problems viewing remotely. I now have 5Mb/sec upload and it has great viewing on four WiFi cams simultaneously on a PC. On the smartphone the old internet way I could barely get one wifi cam to connect and display at a very slow rate if it would even connect. I cannot stress this enough, you need really good, say 5Mb/sec, upload at the WiFi cam end.
3) I highly recommend that a small UPS be used to power the WiFi router and the WiFi cam.
These Lorex wifi cams allow talking (audio) in both directions but you will need a regular powered speaker to plug into the wifi cam.
You will be able to view any of your remote cams on you smart phone or on your PC/Laptop using LView (make sure you get v1.0.10 (or if available later version). This LView allows digital zoom.
Watch for them going on sale to save big bucks! That is how I purchased mine.
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