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. 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)
It is very simple, actually. Connect the balance connector of your LiPo battery to alarm pins, the black balance wire must be connected to the pin marked as negative (-), see right side pin in the picture above.
Great safety accessory. I have one permanently mounted on the arm of my Quad 450 with foam tape and a small cable tie. Buy several and connect to flight battery before you fly. Good loud alarm that can be heard several feet away.
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I love this smal alarm system. Easy to fit and very safe. After connetion, it check every cell of your Lipo and the horn will be activated for a second. It is very loud and a nice working tool for more saftey.