US DC 9V 1A Switching Power Supply adapter Reverse Polarity Negative Inside US DC 9V 1A Switching Power Supply adapter Reverse Polarity Negative Inside Input: AC 100-240V, 50-60Hz Output: DC 9V 1A DC Plus Dimension: 5.5*2.5 mm DC Plug polarity: Positive Outside, Negative Inside. Great for Casio 9V 1A(or below)Replacement,US Standard Plug. Overload Protection,Short Circuit Protection,Over voltage protection MONEY BACK GUARANTEE -MONEY BACK GUARANTEE - We are Company that wants your Repeat Business so, if You Do Not Like our Product or Don't Want It For Any Reason, We Will Happily Accept The Return and Give Your Money Back. No Questions Asked. 30 Days Money Back Guarantee - 24 Months - Exchange.