M. Erb's comments in his very helpful July 21, 2014 are spot on and I'll try not to simply repeat what he said. Do read and watch his review, though, because it's thorough.

I tested this in a relatively modern vehicle (a 2014 model) and played around with how much I could load it. The 12 volt socket in it is on a 15 Amp fuse, so 12 x 15 = 180 Watts, which is more than the 70 Watt capacity of this socket multiplier. Add in the 2.1 Amps the USB port draws and the total is increased by another 25.2 Watts to 92.2. Still less than my vehicle's capacity. On older vehicles you could easily blow the fuse if you go crazy with this thing. Because I am silly I plugged in one four port USB charger and hung two phones and two tablets off it, then two single chargers to which I connected a bluetooth speaker and a bluetooth dash mounted camera. This device ran for a trip to and from a location thirty miles away without becoming overly hot (it was warm at the end of the trip), and without any issues with respect to charging the devices.

As M. Erb implied, this is not a substitute for the many multi-USB chargers on the market. It's for extending the number of sockets in you vehicle for older GPS chargers and other devices that were designed to power a specific device before USB ports because the de facto standard. In fact, I am donating my review sample to a friend who is in just that situation.

Do the math before buying this or even a multi-port USB charger. Find out what the fuse or breaker size is that serves your vehicle's lighter socket. If it's on a 12 volt system (most are), multiply that by 12 and you will find the maximum load in Watts the socket can provide. Next add the capacities in Amps that the devices you plan to plug into this consumes. For example a 2100mAh device is 2.1 Amps. Multiply those by the voltage they require. Most phones and tablets expect 5 volts, some older GPS and other devices expect 12. Multiply their Amp draw by their required voltage, then add the products of those computations. If they exceed 70 Watts (not counting the USB that this has) or the maximum Watts your vehicle's socket can handle, this will not work.

If your computations do indicate that your vehicle and planned use are within the capabilities of this socket extender then I can assure you that it's a well designed and constructed unit. It handled everything I could throw at it in my limited tests, and it runs cooler than I expected. The real bottom line is if you need one for legacy devices and you do not plan to overload it or your vehicle, this is a good solution."

* Can draw 70 watts, that's a lot.

* Has 2.1 mAh USB port so that smart phones an devices can be charged quickly.

* Allows one to plug three cigarette lighter devices and chargers into one cigarette lighter socket. That's an unusual need but can lead to being able to plug in a lot of phones at once depending on one's vehicle.

I think this can be useful in large passenger vans. 3-socket charger provided by Lumsing."

July 24, 2014 - Holy Smokes... I just did some nightime driving and the blue LED in this thing is super bright... blindingly bright if you have this mounted in such a way that the LED is pointing towards you. The LED does not have to be that bright. It's distracting at night and I am lowering my rating one star because of that.

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I have been somewhat frustrated with getting power to all my devices that need power when I'm in my car. It's not too difficult anymore to find multi-port USB chargers to satisfy the need to have 3 or more USB ports to charge smartphones, tablets, GPS's and such. But what is most frustrating is that not all of my devices have simple USB plugs... some of them still use the clunkier cigarette lighter plug type of powercord. So since I only have a single cigarette lighter output in my car, I""m forced to plug and unplug things into that single port. This 3-outlet power port does away with that hassle., Not only that, it also has a 5V, 2.1A output (high-power output) that will charge a smartphone or tablet like an iPad.

This little thing has made my life easier in my car and it's compact in size with a single slim cord that plugs into the cigarette lighter. It also has double-sided sticky pads on it to allow you to stick this to something on your dash if you wish. Finally, a blue LED indicates that power is reaching the extender sockets so you don't have to guess if you've got power or not."

This charger is a very simple device, it has no electronics, so the only thing that could go wrong with it if it wired poorly. To test how well it works I used Amp meter to see the level of charge I got on each port - the results are perfect.

Test results:

~~~~~~~~~~~~~~ Port 1_______________13.68 Amp
Port 2_______________13.60 Amp
Port 3_______________13.64 Amp

The charger's port forms a very firm good connection with the car outlet. This charger gives us a lot of options for charging. Each port can take a USB charger or we can plug in a device with a car port charger (like our travel cooler). The charger comes with 20"" cord, so we can move the entire cluster of plugs away from the console which is typically very crowded.

I received this charger from the manufacturer for an honest review be it positive or negative. The charger worked well and provided a lot of flexibility for charging multiple devices. The bright light issue is easy to fix with a piece of electrical tape on top of the charger even though it does detract a little bit from the overall appearance of the unit. "