PHOENIX 2702877 Radioline Series, Wireless Module, 900 MHz, 10.8 to 30.5V dc/100 to 240V ac, 500 kbps, Screw Connection. With six integrated I/O channels, NEMA 4X enclosure, N (female) antenna connection, omnidirectional antenna, point-to-point, star, and mesh networks up to 250 stations