Have $60 to spare? You might just want to check out the Calculator Spy Camera then, as it allows you to discreetly record whatever that is going on around you using a tiny pinhole camera located on the calculator’s side. Apart from the built-in camera recording functionality, it is exactly the same as the standard Casio DS-5500 desktop calculator. Unless your colleague goes through your stuff in an extremely personal way, it is safe to say that this is 100% undetectable! All video will be captured in 640 x 480 resolution at 30 FPS, while snapping stills of 1280 x 960 pixels without anyone else knowing better. The calculator will rely on solar power to work, while its built-in li-ion battery will provide juice for the spy camera.