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Amazon.com: [UL Certified] DC 9V 0.5A 500mA Power Supply Adapter, Plug 5.5mm x 2.1mm, Center Positive,UL Listed : Electronics
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RockPower NT 22 - Power Supply Adapter (9V DC, 500 mA, (-) Center, Euro Plug) | W-Music Distribution
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9V AC/DC Power Supply Adapter 500ma (0.5 amps) AC to DC Electric Transformer Inverter for Small 9-Volt DC Electronic Devices Under 0.5a - Walmart.com
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