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Ready Stock Simple to use Lipoly low voltage alarm that is small and light for on board use, plug's into balance lead for detecting low voltage on individual cells. - When testing full power (>3.6V) 2S (7.2V) lipo battery 2 Green LED lit up. -When testing full power (>3.6V) 3S (7.2V) lipo battery 3 Green LED lit up. - When testing full power (>3.6V) 2S (7.2V) lipo battery 4 Green LED lit up. - A loud alarm will sound and LED will change from Green to Red if any individual cell drops to 3.3v or below. Really Useful in flight/operation if you cant see the LED light. Specification Li-poly Range: 2s~4s Size: 38x25x11mm Weight: 7g Voltage Accuracy: 0.03v Low Voltage Alarm Threshold: 3.3v (per cell)