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Speaker 3 Watt 4 Ohm Compatible with Arduino Motherboard, 2.54mm Dupont Interface. It is Ideal for a Variety of Small Electronic Projects. Speakers - Newegg.com
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Amazon.com: Leen4You Motherboard Speaker Computer Desktop PC Motherboard Speaker Connector Plug PC Mainboard Internal BIOS Beep Code Internal Speaker Buzzer (Pack of 10) : Electronics