40 pin 2 Ports Dual USB 3.0 OTG Kit Adapter for Asus EeePad Transformer TF700 TF300 TF201 TF101

I recently bought this same device, and there's good and bad about it.The good? It works as advertised, and supports two USB devices at once. I even plugged in a wireless dongle for a keyboard and mouse into one of the ports, and it recognized them both! The Transformer Series is pretty robust in detecting USB devices, so it makes this a very useful thing.This isn't a perfect product though. The two USB ports fit in the same amount of real estate that Asus uses for a single port in their official dongle. This means the two USB ports are placed really really close to each other, and if you have any sort of plastic housing on your USB port, it's likely going to block the other port out. In order to get around this, I opted to take a couple of USB extension cables, short ones, and either cut down the soft plastic, or filed down the hard plastic so that they were about as thin as the USB plug itself. It means I have more of a cluster of cables than I was expecting, but it does allow the device to be fully usable.So, if you need the USB ports and don't want the dock, this is a good deal, but be prepared to tinker to get devices to fit in both ports!