E53 Series Tubular Capacitive Proximity Sensor, 0.71 dia, dist 8 mm, 300 mA DC, NO NPN Open Collector, 300 mA SS Output, 8 Ft. (2.5m) Cable, 10–30 Vdc input, <5% accuracy, Short circuit and reverse polarity, Shielded, 6.6 Ft. (2m)