The record power ac400 two stage air filter with remote 3 speeds and time delay is a new air filter which offers great features performance results and price it has a two stage filtration system with pocket filters that provide filtration down to the crucial 1 micron level three speeds and a timer to off function so you can leave it running in the workshop knowing you will return to not only clean air but also a switched off machine these functions can be controlled by the handy included