BOM-DAT/CONN-DAT/CONN-DC-barrel-jack-dat/CONN-DC-barrel-jack-dat.md
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+# CONN-DC-barrel-jack-dat
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+1. Barrel Jack Size (Diameter/Length)
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+- 5.5mm x 2.1mm: The most common size used for many consumer electronics, including CCTV cameras, routers, and small gadgets.
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+- 5.5mm x 2.5mm: Slightly larger than the 2.1mm and often used in higher-power devices like audio equipment.
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+- 4.0mm x 1.7mm: A smaller size typically used for more compact devices like some wireless routers or small portable electronics.
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+- 7.4mm x 5.0mm: A larger size often used for laptops and some larger equipment.
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FAQ-dat/invoice-dat/invoice-dat.md
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+# invoice-dat
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+Dear customer,
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+We are a small company running an automated online store, we only support online store payment. 
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+You can find shipping costs and options while online checkout.
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+If you need a proforma invoice, you can hold the payment (hold on the last step while checkout and keep it as a pending order). I will email you it later as a PDF.
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+If you just need an invoice afterward, you can place the order directly, and download the invoice later from your account page.
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+Thank you. Best Regards
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