?This is Rechargeable 3.7V 4000mAh Backup Battery Cover Power Case for iPhone 6s/6 4.7" Black. With the 4000mAh battery pack providing extra hours of talk time， you will never have to worry about your phone dying. Moreover， ultra slim and lightweight back cover offers protection against scratches， minor drops and bumps to the phone without adding bulk. Simple sleek design makes a great match with iPhone.                                    Features            4000mAh battery offers up to extra hours of talk timeOffer protection against scratches， minor drops and bumpsUltra slim and lightweight design， won’t add any bulkSimple sleek design， precise fitSuitable for iPhone 6s 4.7" and iphone 6 4.7"， Does not fit 5.5 " iPhone 6 Plus or iphone 6s plusUse your own iPhone 6s / 6 original charge/data cable to charge it. (Cable is not included)Note: Don▽t dispose it into fire or water<br>Never attempt to disassemble or reassemble<br>At least charge it for 6 hours one time.<br>You have to press it for 3-6 seconds to turn it on/off                                                            Specifications            Battery Capacity    3.7V 4000mA    <br>Battery Type    Lithium Polymer Battery    <br>Input    5V 1A    <br>Output    5V 0.8A    <br>Case Material    ABS    <br>Suitable for    iPhone 6s 4.7"/ iphone 6 4.7"    <br>Color    Black    <br>Dimensions    (5.91 x 2.76 x 0.55)" / (15 x 7 x 1.4)cm (L x W x H)    <br>Weight    4.44oz / 126g    <br>ChargingTime    6-10h    <br>                                                            Package Includes            1 x Rechargeable Backup Battery Case1 x User Manual