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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,

【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

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S-001 single-person training version wireless laser timer (2020.2.23 new version）

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