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Tenniix Voice Armband Module YGroup_auroom_baia Most blue blockers either blockTenniix Voice Armband Module Hands Free Voice Control for Tenniix Ball Machines Add hands free voice command control to a compatible Tenniix ball machine with the Voice Armband Module. Worn on the arm, it lets you start, stop, and adjust drills mid rally without reaching for your phone. Weighs just 60g. Note: using two or more Voice Armband Modules simultaneously is not recommended.