Professional Racing CE Approved Lap Clock Recorder Receiver IR Transmitter for Motorcycle Car Karting Bursig Bike Track -- We are factory seller, all models are produced by our own factory! And all items are CE approved! Choose what you want them in your racing kit: V3 transmitter: Made of plastic, one transmitter can work with unlimited receivers, no matter V1 receiver, V2 receiver or V3 receiver, all works; V1 receiver: 1" interval 940nm 0.01" precision, without wire, made of plastic; V2 receiver: 1" interval 940nm 0.01" precision, with wire, made of plastic; V3 receiver: 10" interval 940nm 0.01" precision, with wire, made of plastic ;V3 metal BK receiver: 10" interval 940nm 0.01" precision, with cable, made of metal, black color; V3 metal RD receiver: 10" interval 940nm 0.01" precision, with cable, made of metal, red color; V3 metal SR receiver: 10" interval 940nm 0.01" precision, with cable, made of Metal, Silver Color; V3 metal GY receiver: 10" interval 940nm 0.01" precision, with cable, made of Metal, Gray Color; V3 metal GY receiver: 10" interval 940nm 0.01" precision, with cable , made of metal, yellow/gold color; V4 receiver: 10" interval 940nm 0.01" precision, with wire, made of plastic; V4 transmitter: kindly note V4 transmitter can work with V4 receiver only!! One set V1: One transmitter and one V1 plastic receiver; One set V2: One transmitter and one V2 plastic receiver; One set V3: One transmitter and one V3 plastic receiver; You no longer have to have someone standing at the track to count your time. 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 human hand. So after you receive the item, open the box, insert 2*AA battery into the transmitter and paste the clock on any part of the bike, you will have a perfect automatic lap timer. The timer comes with a manual and takes less than 1 minute to learn to use. Technical copy manual: Lap timer is an exciting item for most users and dealers. Some functions have been removed that will not be used by most users, 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 through the signal wall; A short press will stop the timer from counting, and the LCD will change to the last record; Transmitter: 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; The time tolerance of this device is 0.0035 seconds for each lap; (CPU) This device is designed for track day and coaches; It has all the basic features that are required for track day. Product size: 60mm x 40mm x 12mm OMax lap time and maximum total time: 99 minutes 59 seconds; OMax lap for recording: 64 laps; When there is a continuous signal, only the first signal will be counted ;The signal receiver is built into the timer, make sure the receiver is exposed to? Wall signal? Created by the transmitter; Laser pointer helps build the signal wall; To do? Walls? Vertical to the track as possible;OWhen you are unable to expose the signal receiver on? Signal wall?, try turni