Bestseller Ultrared Infrared Lap Timer + Transmitter Combined Recorder Kit for Motorcycle Karting MX Racing Trac k Bursig.com -- We are factory seller!! OEM and ODM factory. Please note that Bursig.com is our only authorized trademark! To protect your legitimate rights and interests, do not be deceived by any other imitators. Features on this lap clock:1. 1.5m extension cable for all applications; the timer can now be used in cars, motorcycles, dirt bikes, minibikes, bicycles, skateboards, snowboards and many more...2. Ir-eye can be placed anywhere. This listing comes with a transmitter and timer. So you no longer have to have someone standing at the track to count the time for you. The infrared lap clock will count the lap time for you with an accuracy of 0.02s/lap, which is 30 times more accurate than the human hand. This is a complete Ultraared Lap Timer kit, which is exactly the same system as UltraLap Mini, but with a completely new design and workmanship. So after you receive the item, open the box and paste the clock on any part on your bike, you will have a perfect automatic lap clock. The timer comes with user manual and takes less than 1 minute to learn to use. Technical manual copy: This lap clock is an exciting item for most users and dealers. Some functions that will not be used by most users have been removed, so the production cost reaches the limit. The system consists of a transmitter and a timer (signal receiver); One transmitter can work with all lap timers that are on the same frequency. Two rear AA batteries are recommended for the transmitter. Lap timer (receiver): UP: LCD display shows one lap backward; DOWN: LCD shows one lap ahead; Sum : summary; Slowest lap time, fastest lap time, total time and average lap time; CLR: a two-second press will clear the memory and turn on the signal receiver, so the timer will start counting when it passes the signal wall; short press will stop the timer from counting and the LCD will change to the last record; Transmitter: The transmitter has a laser pointer and a signal relay to build a "signal wall"; It is powered by 2 AA batteries; Lasts for 5 hours continuously; It is suggested to turn off the transmitter during idle to save power; Note: Batteries should be replaced after 5 hours of use to avoid weak signals; Remove the batteries from the box during long idle; It is prohibited to point the laser at the eyes, keep the product away from children.Before use;1. Turn on the power. The switch should be in the On position; The LCD display will show the total lap time of the last session; if the record has been cleared, the signal receiver will start working; And the LCD will show: 2.Press CLR for more than 2 seconds, the memory will be cleared and the signal receiver will be turned on; The LCD will show:3. Before starting the bike, make sure the signal receiver is turned on (make sure the sign is active)4. When the LCD shows that the signal receiver is turned on, UP \ Down \ SUM will be inactive; 5. When the bike passes the infrared signal for the first time, the lap will turn 1 and the clock will start counting;6. The last lap record will be displayed for 10 seconds on the LCD display; And then the real-time record will be displayed;7. To stop time counting, press the CLR button; The signal receiver will be turned off and the total time will be displayed on the LCD display; After use:9. When the signal receiver is turned off, the CLR is inactive unless press it for 2 seconds to clear the memory and start the next count; 10. When the device is idle for 20 minutes (no signal, no button), the system will enter sleep state to save power; About the time tolerance of this device is 0.0035 seconds for each lap; (CPU) This device is designed for track days and coaches; It has all the basic functions required for track day. About product size: 60mm x 40mm x 12mm About maximum lap time and maximum total time: 99 minutes 59 seconds; About Max lap for recording: 64 laps; About when there is a continuous signal, only the first signal will be counted;O the signal receiver is built into the timer, make sure the receiver is exposed to the "signal wall" created by the transmitter;O The laser pointer helps to build the signal wall; Make the "wall" as vertical as possible; About when you are unable to expose the signal receiver on the "signal wall", try to rotate the "wall" to different angles;