• Exclusive PowerIQ Technology: Detects your device to deliver its fastest possible charge speed up to 2.4 amps per port or 8 amps overall.
• Family-Sized: An industry-leading 40 watts through five ports lets you charge any combination of phones, tablets or other USB-charged devices simultaneously.
• Guaranteed Safety: UL certified design, industry grade materials and premium circuitry ensure superior performance and reliability. 100-240 volt input ideal for international travel.
• What You Get: Anker 40W 5-Port Desktop Charger, 5ft / 150cm detachable power cord, welcome guide, our fan-favorite 18-month warranty and friendly customer service.

Specifications
Input: AC 100-240V
Output: 5V / 8A overall / 2.4A max per port (Note: an iPhone draws a 1A current, a Galaxy S5 draws 2.1A and an iPad Air 2.4A)
Size: 3.6 × 2.3 × 1.0in ( ~pack of cards)
Weight: 4.6oz ( ~baseball)

For Optimal Use :
– Use your device’s original cable or a third-party certified one (such as MFi).
– Compatible with all Apple and Android smartphones, tablets (including the Nexus 7) and other USB-charged devices. The iPod nano, iPod Classic, HP TouchPad, LG G2 and Asus tablets are not supported.

More detailed and purchase information here : Anker® 40W 5-Port High Speed Desktop USB Charger with PowerIQ Technology

Helpful Customer Reviews :

“Draws zero watts idle : I attached this to a Kill-A-Watt power meter. Then I plugged in zero to four devices. It scales up power draw as you add each device. Furthermore, when a device is finished charging, it drops the draw again. Draws zero watts (I assume rounded down from something between 0.0 and 0.049 watts) when there are no devices attached or all devices are charged. This enables me to leave it plugged in 24/7 – significantly better than all the plugging and unplugging I used to do. — stannius”

“Extremely powerful wall charger that works great : The Anker 40W 5V/8A 5-Port USB wall charger is one of the most powerful wall chargers I have ever received.
Pros:
-8 amps of output power to the USB’s
-5 USB ports (all 5 USB ports share the 8 amps of output power)
-Each USB port has a max output of 2.4 amps
-The USB ports are “Smart Ports” which adjust to how much power the device needs to charge at max speed
-Small and portable (size of a deck of card)
-Uses a 5ft power cord that allows the user to put the wall charger to a desired location
-Great for international use by using AC 100-240v input voltage
-Has overvoltage, overcurrent, overheating and short circuits protection
-Can charge and iPad Air, iPad 1, iPad 2 and iPad 3 each at 2 amps
-Can charge 5 tablets at once but is recommend for an overnight charge because the tablets are not charging at full speed
-Works with all USB chargeable phones, tablets and other USB chargeable devices
-No annoying LED status light
-Ideal for a family/person who has many tablets and smartphones (I have an iPad Air, iPhone 5 and an iPod touch 5 that works great with this wall charger)
-Makes an excellent gift
-Looks great
-Excellent price
-Well designed
-Very high quality construction
-18 month warranty
-UL listed (updated version!)

No cons found!

My wishes to make this product perfect:
-Make the max output 12 amps so 5 tablets, like an iPad, can charge at full speed at 2.4 amps
-Add micro suction on one side so I can stick it to my night stand

This is a very powerful and well-designed wall charger and I highly recommend it.

UPDATE 3/31/14: I have been using this wall charger everyday since I made the review. I have had no problems with charging my iPad Air, iPod touch 5, iPhone 5 and 2 other USB chargeable devices when using this wall charger. I love it! — Zachary S.”

“Finally someone got it right! :
+ Works exactly as expected. Worry free charging for nearly any USB device (apple, android, tablet) on any of the 5 ports.
+ Compact, silent, sleek and no annoying lights (LED, blinking, or otherwise).
+ Gets only slightly warm when charging: neither too hot to handle nor enough to burn.
+ Draws minimal power when not charging devices (10mA at idle), so few concerns leaving it plugged in.
+ Best price to performance ratio in the market at an excellent price point ($26).
— Charges Wii U Pro and PS4 controllers but possibly not PS3 controllers, PS Move controllers, or PS Vita (no consensus).
— The major unknown is long-term reliability. It’s new, only time will tell if it lasts. (6 months so far, have 3 of them now…all good).
— CE+FCC marked, RoHS compliant, but don’t see a UL listing. This could be a problem for the corporate/government environment.

I’ve been in the market for a good USB charger for the past few years. The number of devices I own that charge via USB seems to have exploded recently. Between the mix of android, iOS, and other devices (kindle, raspberry pi, etc) that I have, I was puzzled that no one had created a reasonable product that would charge all of them. Now, yes, I know there are several devices that have labelled ports (2.1 Amps, iOS, Android, etc), or dedicated chargers, but it’s all such a hassle. You have to keep track of which port went to which device, keep track of cables, and all that. What a mess! Confuse something up and your device would either charge too slowly and not have a full charge in the morning, or worse, not charge at all! All I wanted was something where I didn’t have to worry about what device I was plugging into what port or with what cable. I wanted it to “just work.” Charge any device I throw at it at full speed on any port. Make it foolproof! Mercy, is that really too much to ask?

Gratefully, that’s no longer too much to ask for. I’ve only had it for a little over three months now, but I am very impressed. I’ve now bought three of them, all flawless. It works exactly as described: full power to every device (Apple tablets, Android tablets, Android phones, Kindles, Raspberry Pis). It does so silently (no buzzing, hissing, or whining sounds) and without any annoying bright or flashing LED lights anywhere. Yes, it’s completely sans-lights, remarkable! Finally, a manufacturer with some sense. I’m really hoping this thing is built to last (it certainly feels like it might be, but only time will tell).

I don’t have enough 10W sucking iPads to push the limits of the power ratings, but between the assortment of devices that I have, I was able to verify 25W of power drawn simultaneously without issue regardless of port via a Weanas power meter. It also draws 10mA when not charging, so it’s quite efficient to leave plugged in. Note however, that most devices will continue to draw some power (usually cycle between charging and idle) even when fully charged, so you have to remember to unplug the devices from the charger when fully charged if you’re very power conscious. For the vast majority of use cases, (i.e. those involving a mix of high and low power draw devices like phones and tablets), this should meet and exceed all requirements. Note though, that at only 40W, it can only provide high speed charging to four iPads simultaneously (or other similar big 2A draw devices). So if you’re eying this as an iPad charging station, it will work, but I would recommend designating only four iPads per charger.

I should note that it does warm up a bit when charging. This is to be expected of anything pushing over 25W, but it doesn’t seem to get too hot, only mildly warm. I have no concerns as far as any accidental contact burns or for those with curious children.

In summary, it’s sleek, compact, and does its job well. It’s also in a class of its own at this very low price point. You won’t get a better ratio of devices per dollar at this time. Trust me, I’ve looked. So if, like me, you’re tired of futzing with dedicated chargers or those kludgey multi-chargers that only work sometimes with only some devices on _only_ some ports, buy this well-designed but affordable charger. The stress you’ll lose and the hassle you’ll save as a result alone will pay for itself many times over. — DigiForceps”

More detailed and purchase information here : Anker® 40W 5-Port High Speed Desktop USB Charger with PowerIQ Technology