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Miniature motor switch at preset height for electric glider competitions (ERES) and altimeter / variometer with a resolution of 0.1 m compatible with telemetry systems JETI Duplex EX, Multiplex MSB, Graupner HoTT, Futaba S.BUS2. Dimensions 32x12x5mm, weight 7g, power supply 3.5-12V. Connected between the receiver and the controller, adjustable with the help of a Jetibox or a transmitter.