Calculator Hidden Spy Camera with Built in DVR. This awesome spy calculator can do more than just calculate numbers. It comes with a hidden spy camera so you have an extra pair of eyes where ever you may need it. It records in crisp clear 720×480 resolution at 30fps and has a 16GB memory to store almost 10 hours of video footage. If you are constantly missing things in the office, think someone might be stealing, or just want to see if employees work while you are not around then spy calculator is the right camera for you. This awesome calculator will can blend right into any office environment and no one will ever think twice about it. It has a 3 hour battery life. Features: 720×480 video resolution, 3 hour battery life, works with Windows and Mac OS, 16GB memory, dimensions 6 1/2″ x 6 1/4″ x 1 3/4″. Includes: calculator camera, USB cable, user manual.