1.Portable power bank. Built-in security lithium battery, no pollution. 2.Built-in smart chip to control the charging circuit, high reliability 3.High compatibility with all model mobile , emergency power bank. .1a 10.Conversion efficiency over 80% 11.Cycle life more than 500 times 12.Operating temperature: -10~50¡ãc 13.Dimension : 10*7*2.5 cm 14.Beautiful and elegant surface 15.Support oem & odm Dimension : 10*7*2.5 cm Weight: 0.5kg/pcs