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Service Email: [email protected] We have our own manufacture factory that specialize in arduino kit. We are committed to providing long-term value-added services to maintain our customers with more professional technology, superior products and rigorous quality inspection. Thank you very much for your sustained support and believing in DingMai. We will be super happy to receive your valuable suggestions for our products. Specifications: ⊙ Color:Black ⊙ Model: HR-158 ⊙ Input: 100V~240V , 50~60Hz ⊙ Output: DC 9V 1A / 1000mA ⊙ DC Plug Size: - Outer Diameter: 5.5mm. - Inner Diameter: 2.5mm(compatible with 2.1mm) ⊙ Plug Specifications: US Plug ⊙ Adapters Connector: - Inside: Positive (+) - Outside: Negative (-) ⊙ Line length: 1m Package Include : 1 X 9V 1A Power Supply Adapter