LAVA SimulCharge USB 1-port Adapter for Samsung Galaxy Tab 4/S/PRO/Note - Model TL-002 (Micro USB OTG Host & Charge)

The only OTG with charging that worked for me. It did not charge with wall adapter, and will not charge with smart batteries or chargers. I was able to get it to work with a ravpower usb battery charger, but not with my Anker as it has smart quick charging. Also did not work with $10 battery from walmart. I got it to charge with usb power from my car inverter I got from a loves truck stop. I think if you can get a constant low current usb charger without electronics controlling the power output it will charge and give you access to your usb drive. I think it is the charger needing to read from the device you are charging to turn on its output. This is why I think constant low current (slow charging, not fast charge) will fix the problem.

I did my research and this Lava TL-002 SimulCharge does work as advertised, although there are some issues. I purchased a Samsung S2 8" tablet because it was shown on Lava website to be compatible. Sure enough, if you hook everything up correctly in the correct order, it will charge the tablet while in USB Host mode and supply the power and full function to the USB device. I use a 5V, 2.1 amp charger. I have not tested it with any power-hungry USB devices, but it works fine on my DragonFly USB DAC (digital-analog-converter). I use the tablet/phone app, USB Audio Player Pro, which plays my hi-res music and also hooks up with Tidal music service. The line out on the DragonFly goes to my car stereo, amplifier, or headphones and sounds great. In fact, this is a great system that took a while to research and get everything to function as needed. I installed a SanDisc 200 Gb card in the Samsung S2 tablet which holds all my music and works perfect.One negative on this Lava TL-002 SimulCharge is that it is apparently required to hook to power first and make sure it is charging the phone or tablet. Then you can hook the USB device and the USB device will receive its power from the charging circuit and the phone/tablet is still charging. The 2nd issue is that the cables and connections on the Lava are not too good because if you accidentally barely move the cables, it will lose connection and quit working correctly. I have only had this a couple days and have everything working great. Hopefully it will keep working. I wish it was heavier duty and the cable connections were more robust. It is quite expensive compared to other "on-the-go" cables that supposedly charge and power a USB device. I could never get any other setup to charge while in USB host mode, so this works! 4 stars because it could be better.

If you want to use a new'er external hard drive, Forget this unit, it's fine to plug in a flash type drive, but hopeless with a more powerfull new type external hard drive, I am using a Galaxy Tab s, with a new Toshiba 1tb usb external, and frankly, not a chance of the Lava working with the Toshiba. It does a fine job with my small 128 and 512 flas sticks.

This works very well. I am using it with a Samsung Galaxy Tab S 8.4, and a MyDigital SSD OTG 512GB solid state drive. I've used it for about a month now, with no issues. This adapter DOES charge and provide OTG data access at the same time.As far as I can tell, this is the only product on the market that can do both those things concurrently (except for something advertised on eBay that claims to do both, IF you put some switches in the right position, and then power it down every time you need to unplug the charger.) So in this respect, the Lava product seems unique.I do think it is quite overpriced, since the components to this thing certainly can't cost that much. And if Lava feels they need to recover design costs, they should do so through more "quantity" and not more "price", by marketing this thing a lot better and wider - since the company basically has a monopoly position for allowing an Android tablet to connect with serious storage capability (i.e., bigger than a USB memory stick). Go to the manufacturers web page to see what devices it claims "compatibility" with... but in my opinion there is no reason to believe that it would not work with any USB OTG capable tablet. (The Samsung doesn't even have to be rooted.)As an aside, another thing I suspect - it's not the Lava adapter's "box" that is the "special thing" that allows for simultaneous charging and data flow. Rather, I think it is the special cable they supply that runs between the adapter box and the tablet. I know this, because I tried substituting out for that cable, with a dozen or so products. Nothing allowed for simultaneous charging and data flow - it was "either / or", depending on what I hooked up - until I restored Lava's supplied cable to its proper place. So I think it is this specially engineered cable that is the "magic" here.Regarding photos: in one photo - see charging indicator in top right (while access to the music albums is concurrent). The other photo shows the interior connections - I normally keep all that stuff inside the tablet case's pouch.In sum - this works, and it enables your tablet to have direct access to 256GB, 512GB, 1TB... of fast solid state storage. For me, among other things, it's now a (much) better iPod than the iPod classic.