Battery: 7.4V battery for the helicopter (included), 4 1.5AA batteries for the transmitter (not included). Easy and quick installation, effective battery protection, and extended lifespan. BNF Version: without transmitter, and it is compatible with the transmitter of most other helicopters from RC ERA (such as: C032/C138/C123/C190/C189/C187/C186/C129V2).
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