OSE Parallel Harness with 10 gauge wire for use with EC8 bullet connectors. Using this will allow the use of two batteries to double the system MAH but the voltage will be the same. Includes:Everything in the picture.8 Gauge Wire soldered to the EC8 connectors. Note:Because runtime is doubled, it's important to monitor heat buildup in the motor, ESC, and batteries. You must use two battery packs of the same exact specifications, age, and quality. Failure to do so could cause a fire.