12x 2-wire LMS/BR Ground Signal _ A pack of 12 x 3-lamp plug and play signals in 4mm scale (OO) supplied with NO control board. The DCD-MGS-BR is the classic 3-lamp ground signal. It was first introduced in the mid 1930 and spread far and wide. Most are still in use today. This makes it a great choice for layouts of many prototypes and periods. 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.