RIB® EnOcean® Wireless Relay, Enclosed Transceiver/Repeater, Series: EN3 Series, Two-Way Communication, 24 VAC/VDC Coil, SPDT, 20 A at 277 VAC Contact, Surface Mount, Screw Terminal, NEMA 1, -30 to 140 deg F, 2.3 in L x 3.2 in W x 1.8 in H