Protective Rechargeable Portable 4.7 inch 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 (Gold) XCOMM is genuine Apple MFi (Made For iPhone) Manufacturing Licensee (you can look up our name XCOMM in MFi list at https://mfi.apple.com/MFiWeb/getFAQNDA.action after accepting an online Nondisclosure Agreement). We have designed, manufactured and supplied in very large quantities for various OEM brands. Double battery life: The built-in 3200 mAh high capacity lithium-polymer battery provides 100% additional battery life to your iPhone 6 (4.7 Extremely safe and environmentally friendly: 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 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 or warranty needs.