Yubi Power Yp250a 2500mah Ultra Compact Lipstick Size Portable Power Bank Backup External Battery Charger for Smartphones- [Stylish and Tiny 3.70 X 0.86 X 0.86 Inch Dimensions] 2 Colors (2 -Pack) Silver & Black Enjoy the variety of 2 different colors to match your purse. Makes a great gift! black & silver 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 three colors shows the current battery state Includes a 1 Year Limited Warranty