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High-quality materials & heat-resistant shell. Safe, reliable power for RockJam Keyboards. Stable, energy-efficient design with multiple protections. Easy plug-and-play use. Compatibility with RockJam RJ-661, RJ761, RJ654, Reebok GB50/GB40s, Adsl Routers, Nektar Keyboard, and other 9V devices (tip: 2.5*5.5mm).