Dual USB Female to 40-Pin Male OTG Adapter for Asus TF201 / TF300 / TF301T / TF700T

Pros: Inexpensive alternative to keyboard dock Not 1, but 2 USB host ports (see cons, however) Works with Generic USB 1.1 hub Works with USB Card Reader and 32GB uSD card Works with USB Flash Drive Works with USB Keyboard Works with USB Mouse Works with Rockboxed Sansa E260 MP3 player Able to charge Samsung Galaxy SIII cell phone

Cons: USB ports are too close together. Even with standard (not oversized) USB cables I could only connect 1 at a time. It is still an advantage to have both ports in case one of them gets broken, but you will have trouble finding many devices small enough to allow use of both ports simultaneously. I tried using a hub to simultaneously use the flash drive and the USB card reader, but no go. Only one of them at a time were recognized by the tf700t.

Other: It's not perfect because the ports are too close together. There is space on the sides of the device that could have been used for one of the ports rather than having both on the "bottom". Alternatively, they could have made it just a tiny bit bigger. Nevertheless, if I want to use both mouse and keyboard simultaneously, I can do this by using a USB hub.

Pros: I have a dock for my Tf101 with USB host and this is a good alternative to dock if you want to travel lighter. All my USB flash drive ans portable hard drive work fine.

Cons: Ports are too close. You can not use both at the same time with normal cables. I have not found a sufficiently fine plug to do that. I don't know if the two can work at the same time.

Other: No reason to pay for 2 USB because only one works at a time.