Boost Case Plus - Protective Case & 2200mAh Extended Battery for iPhone 4 4S (Fits all models iPhone 4S /4) Hybrid two-piece case/battery design, only attach the extra battery when you need it Half-ounce ultra slim snap-on case for iPhone 4 & 4S (Choose from up to 8 different colors) Two ounce 1900mAh detachable extended battery doubles battery life for iPhone 4 & 4S (Available in Matte Black or Glossy White finish) Fully functional battery with Battery Level indication, Power On/Off, and Simultaneous Sync/Charge Innovations Award Winning Design and Made for iPhone certified