Plastic Lap Timer Infrared Receiver Ultrad Beacon Transmitter Car Motorcycle Outdoor Racing Tracker Device with Interval Time Details: Item: Lap Time Transmitter Condition: New Function: Universal for Car Racing Material: Plastic Color: Black Kindly Reminder: V3 Lap timer has 10 seconds interval time, with cable Clock Lap Timer V2 has 1 second interval time, with cable V1 Lap timer has 1 second interval time, without cable Note: Please choose the right lap timer you need. Thanks Batteries are not included due to strict international shipping policy. Lap timer (receiver): UP: LCD 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? 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: 8. 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;9. 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 Maximum lap time and maximum total time: 99 minutes 59 seconds; Maximum lap for recording: 64 laps; When there is a continuous signal, only the first signal counts ;The signal receiver is built into the timer, make sure the receiver is exposed to the signal wall created by the transmitter;The laser pointer helps to build the signal wall; Make the wall as vertical as possible; When you are unable to expose the signal receiver on the signal wall, please try to rotate the wall to different angles;