This Adapter Will Allow You To Hook Up Two Batteries With Standard Male Connectors to a Speed Control with a Standard Female Connector DuraTrax items carry a 90 day warranty. YOU WILL RECEIVE: One Y-Harness (One Standard Female, Two Standard Male Connectors) COMMENTS: The two packs are in parallel, increasing run time, not voltage. ir/jl conn.info updated 2/26/07 jxs updt jxs 05/25/10 &