Coming Data 9V 2A 18W AC/DC Adapter Power Supply w/5.5x2.1/2.5mm DC Barrel Connector (UL Certified) 9 Volt 2 Amp 18 Watt AC/DC Adapter w/ DC Barrel Connector, Tip Size: 5.5x2.1/2.5x10mm Input: AC 100~240V Output: DC 9V 2A, DC cable length: 5 ft., Polarity : Center + Works with 9V Medela Pump in style and devices required 9V 2A DC power and physically fits the plug UL Certified, short circuit protection, Energy Saver Level 5 US seller, ship from US, 1 year limited warranty. For indoor use only.