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【product description】 [Model] SD-558A [Material] engineering plastics, LCD display, electronic components, etc. [Size] Product size 9*4.5*1.5CM; display size 7.3*1.7CM; line length is about 82CM [Power] 1 CR2032 button battery (included) [Packaging] color box elevator [Attachment] A copy of the original Chinese manual 【The main function】 ● Dynamic display of driving mileage, cycling time, real-time vehicle speed, travel time, current time, current date; ● Check the speed, average speed, total driving time, total mileage of the driving, current temperature at any time; ●With luminous function, using high-intensity cold light source, you can see the information at night at a glance (17:00 am - 8:00 am, press any key backlight to light up, after about 4 seconds, it will automatically stop, press any key at other times. bright); ● With metric/imperial unit selection, it is suitable for the use of different users at home and abroad; ● Vehicle fueling/maintenance tips to ensure your car has good performance and longevity; ● With 12/24 hour system, Celsius / Fahrenheit temperature unit selection, perpetual calendar function, let you travel more confident; ● With stopwatch function, let you accurately grasp the game materials; ● With speed reminder function, you can drive safer; ● Wide range of applications, suitable for 4"-40" bicycles/electric vehicles, even on motorcycles; ● Speed comparison instructions, keep abreast of speed changes; ●Using sensors, stable performance, accurate speed, and wide operating temperature; ● Ambient temperature display and clock function; ●Auto standby function