Desinged specifically for DJs. This is a hand held Digital Beat Counter that has an onboard computer which calculates the BPM of any song. There are no wires to hook up. A bright LED display, makes it is easy to see in the dark. Just tap along with the beat of any song and in about 5 seconds the Time Machine II will calcute teh BPM with 99.9% accuracy. Lightweight and about the size of a remote control, you can easily transport The Time Machine II to every gig.