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Hobby King Audio Battery Monitor 3S, New in Package | eBay
JEGS 45030: Low Voltage Monitor | 2S-8S LiPo Batteries | Monitors the Pack Voltage & Individual Cell Voltage | LCD Display | Low Voltage Alarm | Adjustable Alarm from 2.7V to 3.8V
Hobby King Audio Battery Monitor 3S, New in Package | eBay