Its an upgraded chip for the DM4, here is the info straight from http://www.xsfadvantage.com
Easy installation: Pull the stock chip out and plug the new chip in. Thatís it!
One-touch, fast start-up: This provides ďinstant-onĒ capabilities, which allows the marker to be fired as soon as it turns on. This gets rid of the long boot-up sequence and puts less wear on the membrane buttons. Ever been in the start station with 5 seconds till game start? Hit the power button and youíre ready to rock.
Improved cycle based debounce algorithm: Uses the Tadao 4.0 debounce software. All settings are less than 1 millisecond in time!
Adjustable ABS time: Rather than the lengthy 15 second ABS time as used with the stock DM4, the XSF Advantage DM4 chip makes it adjustable, based on your personal preference and your markerís needs. The default is 8 seconds, which is the same as the original LED and LCD Matrix.
LogicR Eye Control: While the eyes are enabled they watch for the bolt movement, giving the marker a dynamic back pulse. This provides a virtually unlimited rate of fire. Additionally, the eyes can tell if they become continuously blocked, and will automatically disable after 5 shots so you donít have to stop mid-game and turn the eyes off manually. Of course, the eye button can still toggle the eyes.
Configurability: Adjustable settings include: backpulse while eyes are disabled, front pulse, loader delay (equivalent to the eye sensitivity on the stock chip), ABS time, and debounce.
Instant Trigger Response: Scans for trigger pulls over 1 million times per second. You will never have trigger pulls ignored due to slow software!
The XSF Advantage DM4 Upgrade Chip gives unprecedented speed and reliability to the DM4.