External Protective Rechargeable Portable iPhone 6 Battery Case, Xcomm MFI iPhone 6 Battery Case (4.7" screen), 3200mAh iPhone 6 Battery Charger Case, iPhone 6 Backup Battery Pack Cover Case (Black) Double battery life: The built-in 3200 mAh high capacity lithium-polymer battery provides 100% additional battery life to your iPhone 6 (4.7), which means EXTRA 255 hours of standby, 7 hours of talk, 30 hours of audio, 9 hours of 4G surfing, 8 hours of video Extremely safe and environmentally friendly: Our factory is Apple MFi Manufacturing Licensee (you can look up our name at https://mfi.apple.com/MFiWeb/getFAQNDA.action after accepting an online Nondisclosure Agreement). This product meets the specifications of CE, FCC, and RoHS from the EU and the US for safety and eco-friendliness, after passing a number of strict tests, including OTA and ATS. Thus, the battery case won't weaken your phone, Wi-Fi, or Bluetooth signal. Slim build and complete 360 protection: this battery case only adds 60% more weight and 0.3" more thickness to iPhone 6, while offering complete protection of an enclosing cover case, against damages in accidental drop and daily wear tear. Worry-free warranty and technical support: We provides a 12-month warranty and free lifetime technical support for this battery case. Please do not hesitate to contact our customer service for any questions.