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【Battery Powered】All devices are built-in batteries, no need to connect a power bank, easy to use. Toolbox packaging, waterproof and shockproof,

YZ Battery Powered Wireless Laser Timer for Sprints, Track Laser Timer 40 Yard Dash, Stopwatch for Lap Running Speed Drills Sking Skating Track Field

Precise timing of a single person moving from the starting point to the end point Effective laser distance: 0-8m , Wireless communication distance

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YZ Battery Powered Wireless Laser Timer for Sprints, Track Laser Timer 40 Yard Dash, Stopwatch for Lap Running Speed Drills Sking Skating Track Field BMX Barrel Racing, Stopwatches - Canada

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🏃【Battery Powered】Charge for 5 hrs and use for 8 hrs, battery percentage reminder design, the switch button is on the side of the timer. No need to

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