Remote Sensor 875 Yards Range 6.5X Magnification Large Touch Screen Kentfaith

SKU: GW56.0042

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I can't tell the exact time but it's really fast. Press the button and it shows the result almost immediately. Measuring the speed will take a longer time, for about 2s. 
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I check the manual and it said you can choose from feet, yard, and meter. 
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Absolutely! My son is 11 years old and he's exactly into it and I guess your boy will love it, too. I also used it as a tool during my outdoor activities. Don't worry. 
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Works well,put it against golf cart gps and is accurate, does a great job 
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Yes. There's a type-c charging cable in the package, you will need an extra charger.