1.(LENGTH DIMENSION)RC Light Bar 8 LED Without length 1.9 Inch ,Length with bracket 5.66inch.Please measure the size of the installation position and select the corresponding length of the light bar. 2.(MATERIAL)Light housing body aluminum alloy anodized black with heat sink, metal side cover metal bracket sturdy and reliable, comes with M2 mounting screws and nuts. (ADAPTATION VOLTAGE)The voltage of the light bar is DC6V, and the light control module adapts to DC6-DC14V input, and outputs DC5.7-DC6V voltage to the lamps after bucking and stabilizing. The light controller has on and off mode, also has manual control button. For more information, please refer to the light bar package manual. 4.(LIGHTING EFFECT )With 24 super bright LEDs, they are so bright you can see about 5 feet ahead of the truck in complete darkness. It is a high quality light bar for RC car night lighting, which brings infinite fun for you and your children's night appearances. ( BUY WITH CONFIDENCE) Superior quality makes us promise that if you don't think this RC light bar is for you, just send us an email and we will offer you a 100percen refund with absolutely no questions asked. This is a high quality metal casing RC car light bar, selected high brightness LED light beads each bead is configured with a resistor, uniform brightness can be used for a long time. Bring unlimited fun and joy for you and your friends or children driving at night. Various lengths are available to choose from, which can be adapted to most car models. Creating value and convenience for all our friends is our pursuit, superior quality makes us promise that if you think this remote control RC light Bar is not for you, just send an email and we will offer you a 100percent refund with absolutely no questions asked.