OSE Parallel Harness with 12 gauge wire for use with EC5 bullet connectors. Using this will allow use of two batteries to double the system MAH but the voltage will be the same. Includes: Everything in the picture. Note:Because runtime is doubled, its 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 due so could cause a fire.