This camera usually used indoors , with plug power . Then you can view  the  scene in the mobile phone . And for this camera size is small ,so it is easy to make installation , you can put it in anywhere that you want to put in the room . 

 It connect by Wifi network, support two-way audio , and built-in MIC and speaker , so you can talk with anyone in the room from your mobile phone . And it also with alarm notification , it will send you message when someone enter your home .