Fits for most RC cars and trucks,RC Models.Lightweight upgrade instantly enhances overall performance in handling and durability Item:Connector Adapter in Parallel Wire Connector: Parallel EC3;1 male (EC3) to 2 female (EC3) Connectors Wire Length: 10cm / 4inch Wire Gauge: 12AWG Heatproof Soft Silicone Cable Package list: 1* EC3 Parallel Parallel Connector Note:When using this adapter,the 2 batteries we recommend the same capacity and the same voltage,otherwise the batteries will produce internal friction between them.