The AC Wall Charger Hidden Spy Camera from Ajoka is one of the most stealthy cameras out there. The tiny spy lens is hidden in a ubiquitous AC adapter plugged into your wall. The camera draws power from the outlet and can record up to 66 hours of audio and color video on a 2 GB micro-SD card. Even when it’s not plugged in, it can record up to 3 hours via it’s internal battery. Stealthy indeed.