Features on this Lap :Extension cord 1.5m for all appliation; the can now be used on cars, motorcycles, dirt-bikes, minbikes, bicycles, skateboards, snowboards and much much more...The can be placed anywhere you want. This bidding comes with the transmitter & the . So you no longer need anybody to stand by the track to count the time . An infrared lap count the lap time at 0.02s/lap accuracy which is 30 times as accurate as human hand. The Lap (Receiver):The LCD shows one lap backward;: The LCD shows one lap forward;: Summary; Slowest lap time, fastest lap time, Total time and average lap time;:A two-second press clear the memory and turn on the signal receiver,so the start to count when it passes the signal wall; A short press stop the from counting,and LCD turns to last record; Note: Batteries need to be replaced after 5 hours of use to avoid weak signals; Take the batteries out of during long idle; It is forbidden to point the laser to eyes, keep the product away from children. The time tolerance of this device is 0.0035 seconds for each lap; (CPU) This device is designed for track day and trainers; It has all basic function that is required for track day. Max Lap time and Max total time: 99 minutes 59 seconds; When there is continuous signal, only the first signal be counted; The signal receiver is built in the , make sure the receiver is exposed to the "Signal wall" created by the transmitter; The helps to build the signal wall; Make the "wall" as vertical to the track as possible; When you are not to expose the signal receiver to the"Signal wall", try to turn the "wall" to different angles Colour:Black Material:plastic Package Contents: 1 x Transmitter 1 x Receiver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.