1. Logitech Logi Circle ($200) This petite security camera outperformed 40 others in experts' tests. Setup is "ridiculously simple," and the device alerts your smartphone when it detects movement. Twenty-four hours of footage can be saved to the cloud for free. Buy it at Amazon. 2. Icontrol Networks Piper NV ($280) Like the Logi Circle, the Piper NV offers sharp night vision, two-way audio, and live video streaming.