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19V 2.1A 40w AC Adapter Battery Charger for Harman Kardon Onyx Studio 3 Wireless speaker NSA40ED-190200 Power Supply - AliExpress
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Amazon.com: Battery for Harman Kardon Onyx Studio 1/2/3/4 Speaker Kratax 3200mAh Real Capacity Replacement Battery, Same Quality As Original Battery for HK Onyx Studio 1 2 3 4 Wireless Bluetooth Speaker : Electronics
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