1.Package includes 20 pieces 3.8" Inch Led Trailer Lights 6LED (10Pcs Red + 10Pcs White); free screws and Foam tape bases are included. The foam tape bases are used to adhere to the back of the marker lights or to the surface to which the light is to be mounted, for waterproofing. Also you can use a little strong adhesive to be sure; 2.These small clearance lights needs to be hooked up to a 12v power source. Flux: 600Lumens (about 20 Lumens per lamp); less than 1 Watt per light; Light Size: 75mm x 20mm x 5mm (2.95" x 0.8" x 0.2"), Light Size with Black Base: 96mm x 20mm x 10mm (3.8" x 0.8" x 0.4") and center to center distance: 3-5/16" approx.; The wire length is about 6~7 inch, and you can put them in series with speaker wire to make them longer; 3.The indicator light is hardwired with 2 wires and can be used as constant on trailer lights: black is negative and the other is positive(Red wire for red lights, white wire for white lights and yellow wire for amber lights); These lights