The PC3 Power System with flash buttons is a complete low voltage switch system for professional mobile or club use. The system includes an 8 channel low voltage on/off and flash button controller (PD-PC3M) with 8 individual switches and a master on/off switch, an 8 remote channel power pack (PD-PC3PACK) and a 25 foot (PD-PC3EXT) connection cable. You can add another power pack so that one controller runs up to two remote power packs.