http://genuineacadapter.com/power-adapter-for-acer-chromebook-c720p29554go3aww-acer-19v-237a342a-3011mm-p-8496.html

Power adapter for Acer Chromebook C720P-29554GO3aww Acer 19V 2.37A/3.42A 3.0*1.1mm

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$26.93

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Power adapter for Acer Chromebook C720P-29554GO3aww

Power AC adapter for Acer Chromebook C720P-29554GO3aww notebook, brand new, 100% compatible with good quality, and free from defects in material and workmanship. 30 Days Money-Back, 12 months warranty. 

Fit with following laptop:

Acer Chromebook C720P-29554GO3aww

Specifications:
• Type: Power AC Adapter
• Input Voltage: AC 100-240V~50/60HZ
• Output Voltage: DC 19V 2.37A/3.42A
• Max. Output Power: 45W/65W
• Connector Size: 3.0*1.1mm (as pictures)
• Manufacture Guaranty: 12 Months
• Operate Environment: Please keep the environment cool and dry!