adapter compatible for 18V Battery. Used as a base to add your batteries, then it puts power out by the wires. A nice way to use yourbatteries for DIY projects, such as connected them to , RC toys, LED Lights, water pump, work lights or Robotics etc. Important Notes: 1. The power wheel adapter is NOT a battery charger, it only outputs directly the voltage and power from your battery. 2. The red wire is connected to the positive terminal, black wire is connected to the negative terminal. 3.When using, make sure the positive and negative wires of the device correspond to the positive and negative wires of the power wheel adapter. 4. If not used for a long time, please be sure to remove the battery form the adapter. 5.This is Not 3D Print Battery Connector, Firmly installed. Note: Due to different production batches, there may be slight differences in products. Colour:Red Material:ABS Package Contents: 1x Battery Adapter with switch fuse holder 3x 30A fuse replacements 1x quick terminal block Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.