Yubi Power YP250AP 2500mAh Ultra Compact Lipstick Size Portable Power Bank Backup External Battery Charger - [Stylish and Tiny 3.70 x 0.86 x 0.86 inch Dimensions] (Purple) Stylish, mini, and light-weight design; Fits easily into any bag or pocket; Compact "Lipstick" Size Capacity; Add 8 hours of talk time or one full charge to your iPhone 4 / 4S / 3G / 3GS; Add 80+ hours of audio playback or a full charge to the battery life of most mobile phone. Grade A cell ensures high quality; LED indicator with two colors shows the current battery state 1 Year Limited Warranty Included