The A20M camera is similar to the E45 in that it has the same resolution (160 x120) detector. It does not have a battery but uses an A/C power supply. It does have control buttons on the top of the camera and can be used alone when plugged into a TV/monitor. The A20M/Researcher package is usually used with a laptop computer and if needed can capture as fast as 30 frames per second. The Researcher software program that comes with it is a very robust analytical software package.
