This is a TireGard tire pressure monitoring system. This system is designed to monitor the pressure and temperature of your tires. Low tire pressure can cause poor handling, rapid tire wear and accidents. The sensors install easily on the valve stems in place of the valve stem caps and the LCD receiver can either be hand held or installed with velcro. The new improved wheel sensors are powered by watch batteries that last 1 to 2 years and the monitor is powered by a AAA battery that lasts approximately 6 months. This comes with batteries, a silicon monitor protector and instructions. This is available in either bike (two tires), trike (three tires) or bike and trailer (four tires) systems and will fit just about every motorcycle out there.  

Feel free to visit the factory website for more info and reviews. http://www.bigbikeparts.com/Inventory/Navision/13-315?catalogNo=