I bought the Lipowarner for my aerobatic model to the voltage always be able to read outside the model, without having to buy myself expensive telemetry. The Warner is directly connected to the balancer of Lipos and then on mounted above the battery compartment on the model outside. Here, however, is not enough, the length of Balancerkabels, it still needs an extension cord be purchased. Thanks to the large, bright LED display in red, with slow fly past the voltage can be easily read. depending on your taste, this can also take place only after the landing. Who wants also program the alarm at a certain voltage, so that when the set number will hear a very loud, really far to listening signal. So it is protected by deep discharge well before battery and damage model. Strong buy recommendation.