XGUO Genuine Leather iPhone 6S Case Slim Fit Window View Flip Book Full Protection Case Cover Skin For Apple iPhone 6 & 6s - 4.7 inch - Black [Safe & Warm as a house] - keep hands toasty daylong, Green and Healthy heattransfer,Anti-scald,Explosion-proof, Radiation-free.High-tech aircraft-grade,aluminum and ABS matrial,Eco-friendly lithium-ion battery,safety protection technology. [ Adjustable Warmer ] - Three temperature mode optional ,Low temp ,Medium temp and High temp.You can choose the best one according your need,long lasting warmth( up to 8 hours ) and rechargeable over 5000 times. [ Fast charger power bank ] Contains 5200 mAh larger capacity,5V/2A, full and fast charge for iPad ,iPhone 8/ 7/6s/6 Plus, Samsung,Nexus and other Android phone and more devices. [ Ergonomic Design ] - Smooth edge and warms on both sides of the unit for better holding experience and transmitting heat to your hand and joint under a high efficiency. [ Portable ] - Pebble Shaped ,smooth and good touching feel.Handy carrying anywhere with any pocket or bag while sporting, fishing,hiking,camping,skiing,quickly warm your hands without overheating indoor and outdoor. A perfect solution in cold weather.