12x 2-wire 4 LED UK Modern Ground Signal _ A pack of 12 x 4-lamp plug and play signals in 4mm scale (OO) supplied with NO control board. The DCD-MGS-MG is a modern UK 4-lamp ground signal that uses LEDS in the prototype. It was first introduced around 2000 and is now being used to replace many 3-light signals as they reach the end of their life. Many are still in use today. This makes it a great choice for more modern layouts of many prototypes. Use as add-on for Alpha Mimic control signal systems OR use independently if you wish. Please note: If used with other power sources resistors MUST be added. (we suggest 5000 ohms or 5k resistors) Failed LEDs because of incorrect connection will not be covered by warranty.