Crazepower One Universal AC Adapter 19.5V 3.33A 65W Battery Charger Lightweight Slim Version Power Supply For HP Pavilion Envy SpectreXT Pro laptops Red color Extremely small size, the design team from the world frist-class university., the design team from the world frist-class university. Connector Size: 4.75 mm x 1.7 mm It has up to 94% efficiency, and attach to a extra USB connector, but works with very low temperature. Not only charging for laptop, also charging for the others mobile phones or digital products. We supply all tips you want and 1 years warranty ! It compatible with following laptop models: HP Pavilion Sleekbook 14-b000 series, HP ENVY Pro Ultrabook 4series, HP Pavilion Sleekbook14-b015dx series, HP ENVPR4 i5-3317U series, HP SpectreXT Pro i5-3317U series. HP SpectreXT Pro i5-3337U series, HP SpectreXT Pro i5-3567U series, HP SpectreXT Pro i7-3537U series, HP ENVY 4 series, HP ENVY 6 series, HP ENVY SLEEKBOOK 4 series, HP ENVY SLEEKBOOK 6 series.