Unitech MS852 is a 2D Imager Barcode Scanner which supports various reading modes. Trigger mode starts decoding after a trigger press and stops after the barcode is decoded or the trigger is released. Auto Aim mode starts decoding when motion is sensed and stops after two seconds of inactivity. Presentation mode starts decoding when a barcode is detected and stops after a period of non-use. Auto Aim with Illumination mode starts decoding when motion is sensed, and stops after two seconds of inactivity. After a good decode, the scanner can optionally beep and/or light up the LEDs.