The Pro Pulse is a fully automatic system which works on a 24 hr basis. The concept is very simple, by removing the sulphate from the battery plates then the battery maintains its "just new" feel. Sulphation builds up on all battery plates which are not correctly charged and is extremely common amongst boat owners who do not have high performance charging systems. It would not be an untrue statement to claim that 9 out of 10 batteries discarded in the boating market could easily be brought back to life with this device.