Coming Data 12V 1A 12W AC/DC Adapter w/ 5.5x2.1mm DC Barrel Connector (UL Certified), Works with Medela 12V Pump in Style Advance 12 Volt 1 Amp 12 Watt Adapter Power Supply w/ DC Barrel Connector, Tip Size: 5.5x2.1x10mm Input: AC 100~240V Output: DC 12V 1A, DC cable Length: 5ft., Polarity : Center + Works with Medela 12V pump in style advanced, Lactina, and Freestyle breast pumps. and devices required 12V 1A 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.