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This is a 2S balance/charge adapter from ProTek R/C. This adapter is designed for 2S Li-Poly hard packs that use two 4mm bullet connectors for the main power connection, and a 2mm bullet connector for the balance connector. This adapter has bullet connectors on the battery end, a female ultra plug to attach to your charge lead, and a Align style balance connector to connect to your balancer on the other end.