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Logitech F540 Wireless Headset Battery (Li-Ion, 3.7V, 700mAh) - Replacement Battery for Logitech 533-000074 Wireless Headset battery - Walmart.com
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Logitech Wireless Headset F540 - Headset - full size - 2.4 GHz - wireless - noise isolating - Walmart.com
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