VPC039D power banks, with large capacity from 2400mah to 5200mah for choice. It has the function of over charge protection, discharge protection, overcurrent protection, short circuit protection.Our product has the certification of CE, RoHS and FCC. Customized design welcomed, you can choose the logo, the package and the color as you like. Features: 1.Good quality with competitive price. 2.Our portable power bank is with power indicator 3.High transfer efficiency low resistance and energy saving. 4.Perfectly compatible with smart mobiles and all 5V digital devices. 5.The portable universal power bank has approved with CE ROHS FCC,MSDS certifications.