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Comes with four 5mm adapters to connect to the carbs, replaceing the vacuum takeoff screws. Restores the power, response, and smothness to your motorcycle. Absolutely accurate (within one mm of mercury). It's Electronic - no moving parts to wearout. It can be used in any position. No hazardous material, i.e. mercury. Portable, it has an internal battery which is included. 9V. One year warrantee. If it doesn't work we will replace it. Very easy to use. Our first product review said "It's experience in a box.". If you use any other diviece you will be more accurate and faster with a Twinmax. A renouned BMW expert said he could always improve on carbs sticks with the Twinmax but could never inprove on the Twinmax with carb sticks. The Twinmax can be used on ANY internal combustion engine with two or more cylinders with two or more carbs or fuel injection. Motorcycles, snowmobiles, classic cars, motorboats, 4 cycle outboard motors, light aircraft, ultralights, etc.. We have been selling these since 1997. WE ARE THE EXPERTS. And we have tuned over 600 bikes of all makes. We can help you get it right. Twinmax HOT LINE 703.987.6342. Please 8am to 9pm MST. Seven days a week. Comes complete with battery, instructions and reducers for your Concours. FREE SHIPPING to any USPS Deliverable address. All Internaitonal orders are by Priority Internaional Registered Mail.