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Representation of the intravaginal probe for the calving alarm system. The base works as an anchoring system while the cylindrical bin contains light and temperature sensors, together with a circuit board equipped with a transmitter. The probe is 174 mm in length, the cylindrical bin is 34 mm in diameter and the fin-shaped base is 78.5 mm in diameter. The rounded extremity contains a magnet for communication with the Central Unit.
