Series Y Harness for use with EC8 bullet connectors. Using this will allow the use of two batteries with the same ESC. Doubling the voltage to your esc/motor. Includes:Everything in the picture.8 Gauge Wire soldered to the EC8 connectors Note: Using this will double the voltage of the system it's used in. You must use two battery packs of the same exact specifications, age, and quality. Failure to do so could cause a fire.