It charges. There really isn't a lot to say about a USB Charger. They are designed to convert a standard US electrical outlet 120 volts AC down to a standard USB 5 volts DC that will pretty much charge any device that uses USB cable charging. According to the website, this device can put out as much as 12 watts of power at 2.4 amps, (The math works, Watts is a Power unit and is equal to Voltage x Amps. So 5 Volts x 2.4 Amps = 12 Watts. So what does this mean, you may ask? Well a typical device hooked to a computer USB may only draw about 500 milliamps or .5 amps. This Insignia USB charger can more than handle the average device and can actually handle charging the bigger phones and tablets that can be rapid charged yet still safe for the smaller phones. This should be a usable substitute to charge one of the big Samsung Galaxy 5 or 6 phones or Galaxy tablets and other devices like an iPhone 4 or Galaxy 3 or 4. But I urge you to read the user manual of your device for specs and precautions. Insignia is the Best Buy brand, I would think Best Buy would do the research to make sure the device was well manufactured and safe before they would put their name and reputation on it. I would not hesitate in using this to charge any major brand phone or camera or device. A word of caution: I might be hesitant to use this charger or ANY charger to charge a cheap knock-off Chinese market e-cigarette item that could be using poorly manufactured Lithium Ion Batteries. It is not the charger that is the problem, but the cheap batteries, a lithium ION battery must be precisely charged to voltage and current to be safely charged. A poorly manufactured Lithium ION may not truly have the design physics to be the same specs. A cheap knock off Lithium ION battery that is not made to correct specs can be dangerous and cheaply manufactured electronics like e-cigarettes may not have voltage safety circuitry in them to insure the battery is not over charged or charged at wrong voltage or current. You have heard reports of batteries exploding. It is the batteries that are at fault, usually not the charger to blame, that a faulty or broken charger could cause a problem. I in most cases it is the bad batteries.
This Insignia USB Charger is a high capacity capable USB charger, safe for major brand phones and tablets using properly designed and manufactured lithium ion batteries. Very safe for this application.
The USB cable is swap-able, so they base will work with any USB cable plugged into it, USB, USB mini, old iPhone or new iPhone style cables.
I am an engineer, I studied electronics. I have no hesitation in using this Insignia charger. It is just a generic Best Buy Brand. Should be safe for most applications of major brand products. Everything said here is only my opinion. Do your own research before buying and using. Apologies if I went into to deep of detail.