Put the Belkin NetCam Wi-Fi Camera in any room, then monitor the space with your smartphone or tablet—any time, anywhere—using the free Netcam app. Check in periodically to see what's happening, or choose to receive instant email notification whenever there's movement. The camera boasts not only wide-angle video and digital audio, but a range of handy additional features. For one, you can save room recordings straight to your mobile device. Another: With night vision, you always get a clear picture, whether there are lights on or not. Available at Amazon; $58.