Uses a mechanical sensor flag that is hit by the car as it crosses the finish line. They claim this sensor can withstand millions of hits without damage. However, from the pictures on their site the sensors can get slightly bent, so all of the sensor flags may not line up well, meaning that the lanes with the flags bent less actually have a slight advantage. Finish results and times are announced audibly, though they also support a computer interface. Timer precision is claimed to be better than 0.0001 seconds. Only their rather expensive software will work with their timer. Though, some people have successfully used this timer with GrandPrix Race Manager, using the Custom Timer interface.