Battery Pack, TROND Air 4000mAh Ultra-Slim Portable Charger External Battery Charger Power Bank (2.1A Smart Output, 1.5A Fast Input, Unibody Aluminum

Ultra-Slim Design: At the depth of 0.31 only, just stack your device on top and enjoy uninterrupted use while charging. To match the slim design, one premium flat USB data cable(8.5) is also enclosed in the package.
• Stylish Metallic Finish: Made of aluminum alloy with an elegant metallic finish. Farewell to chunky traditional external battery, and impress others with TROND Air.
• Smarter Charging Experience: Intelligently identifies connected device and deliver its fastest possible charge. Furthermore, 1.5A power input enables TROND Air to be recharged much faster.
• Specifications: - Capacity: 4000mAh - Input: DC 5V / 1.5A (fast recharging) - Output: DC 5V / 2.1A (smart & rapid charging) - Size: 3.74 x 2.56 x 0.31 - Weight: 3.21 oz - Product Warranty: 18-MONTH warranty & 30-DAY money back guarantee
• Compatibility - Apple: iPhone 6(plus) 5S 5C 5 4S 4 (8-pin / 30-pin cable not included) - Samsung: Galaxy S5/S4/S3, Note 4/3/2, Focus, Infuse - Google: Nexus 5/4, Google Glass - HTC: One X/S/V, Sensation XE/XL, Evo 4G, Radar 4G, Inspire 4G, ThunderBolt - MP3, MP4, Digital Camera, GPS, GoPro, and other smartphones such as Motorola, Blackberry, Nokia, etc.