The Pitking Products GPS Lap Timer uses 10hz GPS technology to obtain lap times so no external beacons are required.Current lap time, total time, average lap time and fastest / slowest timeLap, Drag and Section modes with drag racing speed graph3.7v internal battery with 20 hours constant usage timeSelf adhesive Velcro mountingThe Pitking Products GPS Lap Timer has an internal battery which means no hard wiring, simply switch on and go. The unit is selectable between lap, drag and section (rally/hill climb) modes, each with an array of data on hand including total, average, fastest and slowest times as well as max speed.All times can be reviewed later with the drag menu able to display a speed graph of the run. The unit is backlit for ease of use in dark conditions.Supplied with a USB lead for charging.Dimensions: 78 x 50 x 16mm. Weight: 120g.