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Great device that warns you of trouble with your model. Beeps when it detects low or no TX signal, when voltage dips below 4.2 volts and will shriek if you lose the model and shut off the TX. Helps your favorite model "Be Found". Plugs into extra channel or use as a short extension between a servo and your RX. Comes with universal connector. Use only for PPM Systems (not for PCM). SKU Number: GWBF01J