Qi-Infinity Qi Wireless Charger Power Bank (4000 Mah) for Qi Compatible Devices - Black Qi WIRELESS CHARGING POWER BANK  There is no need for cables or wires when bringing this power bank with you. It works well with any Qi compatible or supporting device. No need to look for that sweet spot as the power bank is small enough but has an almost flat surface that covers enough area needed when charging your phones. No need to bring those messy cables with you! Now that is no hassle wireless charging! EFFICIENT AND POWERFUL BATTERY CHARGER - The Qi-Infinity power bank can charge your smart phone once or twice depending on phone types with its built-in battery. It has a high efficiency of ~75% for wireless power transmission with built-in advanced lithium-polymer battery. No need to worry about re-charging as you can use it more than once in a given day! That is great news especially for people who work outdoors and even for those who do not. SAFE AND RELIABLE  The power indicator light tells you if the power bank needs re-charging. It is safe from overheating and overcharging. The material of the power bank is soft to the touch and smooth, and would not scratch your phone. It comes with a touch switch plus it has a rubberized based for that extra hold. You are sure your phone is safe and secure. The 4000 mAh capacity gives you more than what you need. You can definitely rely on this for your power needs whenever you need it. PORTABLE WIRELESS POWER BANK  Feel comfortable to bring this with you wherever you want, whenever you want! The size fits just about any purse or pocket! Worrying about your battery power will no longer be an issue for you. It is not bulky or too heavy. Compact and sturdy, just throw this Qi wireless power bank into your bag and off you go! Anyone can definitely bring this with them. Plus you can re-charge this wirelessly too!