The TWL-5 is an elegant 8.5" x 4.75"H x 2.5"D, Solid Oak box with gold or silver colored accents. Message blacks out when not flashing for extra high-tech effect. Uses low voltage 24VDC lamps for class 2 wiring, eliminating need for a 24 to 110 volt relay interface boxes. Uses 4 lamps wired in parallel preventing total failure. An optional 12V DC power supply is necessary to power this light.