GPS speedometer: 1. Connect the device as picture E, the GPS speedometer start to search GPS signal when power on. Generally, the GPS signal be reached within 300 seconds, and the digital display as counting (from 1 to 300), also the words(GPS...) be flickering as well, until the GPS signal was found, the sympol(GPS) be lighting as normal. There be an Error code "E02" if the GPS input was not be found within 300 seconds. Note:(1) Trip: Total mileage of a working cycle (data be cleared after power off) (2) ODO: Total mileage of driving (data be recorded) 2. Operation: a, Keep pressing the Mode button for 4 seconds to entry setting ODO data, the data increasing as you keep pressing, also, the data be decreasing if you release and again. Data be recorded if release for more than 3 seconds. b, Quick the Mode button to switch the speed unit to / MPH / Knots3 3. Error code: E01: No GPS signal was found after start working E02: GPS signal was lost during working E03: Device failed Working environment: Working voltage:9-32VDC Working current:Less than 120mA Working temperature:-20-70℃ Storage temperature:-30-80℃ Waterproof rating:IP67 Input parameters:GPS signal Colour:White & Silver Material:Stainless steel Package Contents: 1 * GPS digital speedometer 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. Can freely switch kont, mph, km/h speed unit Tips:The picture is a high-definition rendering. The product may be updated constantly,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use. Battery voltage: 9-32V Navigation pointer: 8 directions. : Speed over the ground. TRIP: Single mileage, reset after power failure. ODO: Accumulated mileage, save when power. COG: heading, clockwise angle of