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4 x Digital Speedometer Red Blue LED + NPN Hall Proximity Switch Sensor (Red Color) sold2024 Fiexible Unisex Arm Girth: Made sold2025 Fiexible Unisex Arm Girth: Made of adjustable velcro band HOW TO USE: Get the help first from others before you start covering Parameter InputInput pulse signal: NPN PNP open collector Good performance: the speed panel meter uses the latest A D converter chip and high stability reference IC
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