It's all there! Analogue Gauge, lamda sensor, controller, software, leaflet and stuff. It plugs in to your usual lamda sensor hole, and regulates the mixture as normal, but also tells you what's happening in real time and as a graph on you laptop.
I never really explored the possibilities, only using it to keep an eye on my mixture, running lpg gas. I had the ability to tinker with the LPG ECU and with the aid of this, it was quicker on gas than petrol!
That car will be for sale soon, so I've taken this off. It usually retails for £130+.
It's dead handy!