Three super quality (Panasonic) double pole double throw relays (Standard on-off switching coil type). Adding a relay can double the functionality of a decoder output and make it possible to do things not possible any other way. – You can also use relays to switch devices of much higher power than a decoder function could ever handle. These top quality relays are only 10.6(L) 5.6(W) and 8.6(H). – Perfect for tight spaces and DCC installation switching or other forms of layout control. Gold contacts with a 1 amp contact rating (switching). Coil resistance 810 ohms. Nominal 9v, but usable for switching of all DCC decoder outputs