Simple to use Lipoly low voltage alarm that is small and light for on board use, plugs into balance lead for detecting low voltage on individual cells. A loud alarm will sound and LED will change from Green to Red if any individual cell drops to 3.3v or below.

Spec.
Lipoly Range: 2s~4s
Size: 38x25x11mm
Weight: 7g
Voltage Accuracy: 0.03v
Low Voltage Alarm Threshold: 3.3v (per cell)