Only Work with htc one M7 (Newly-Bulit with 3800mAh High Capacity Li-polymer Battery---This Battery Charger Case can doubles the battery life of your htc one M7 and provide extra 120% battery power with your phone, which is equivalent to an extra 30 hours talking time or 15 hours web surfing. Ultra Slim On-the-Go Design---Featuring a low profile and slim design, you will forget you are carrying extra power juice pack on the go. Ideal for long distance journey and business trip. Stylish& Elegant Design with Simple Use---It is like a Elegant sleeve, you just need to simply slip the phone into the case very fast. ALways Know How Much Power Left---Integrated power switch enable you to turn on/off the battery case quickly. 4-light LED indicator shows the power status of the battery case. And each light represents 25% of the power. Good Quality& Intelligent Protection: Made of high density Li-polymer battery, no memory effect,extra high conversion rate up to 85%, intelligent protection IC can effectively prevent a short circuit or overcharge and over discharge even under extreme operating conditions, which can effectively protect your phone.

• The built-in 3800 mAh grade-A lithium-polymer battery
• Featuring sync-through technology that you can sync your phone to a computer without having to take the battery case off
• Excellent bumper design and hard-shell backplate, Eyoube Portable Charger protects your iPhone from scratches ,dust and fingerprint , yet small and convenient enough to fit easily in your hand or in your pocket
• Eyoube Charger features LED light to indicat the remaining of the power
• With Lightning Charging Port and Kick Stand,convinient to wath video

The built-in 3800 mAh grade-A lithium-polymer batteryEyoube