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4 Power Indicator Battery Detection Module Node MCU ESP8266 V3 (LOLIN CH340 chip) Verify bore diameter specifications before Verify bore diameter specifications before purchase to ensure compatibility with your existing tubing system the buck converter only draws the energy actually needed by your load 4 LEDs lit > Battery fully charged Wide Voltage Compatibility: Designed to work with common battery configurations including 1S 4S lithium ion LiPo packs (specific voltage range varies by version)
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