I know we talked about Meenova mini otg reader before, but here is something similar for half the price. Only $7 shipped, very small footprint, supports microSD, microSDHC, and microSDXC. I tested it with my 128GB Sandisk, works good. Has OTG support so plugs right into any smartphone which supports OTG connection, and obviously recognized by X5 without a problem. When plugged in, only extends by about 26mm. Also comes with micro-usb to usb adapter to connect directly to your computer. Cool little gadget with a nice light glow when plugged in.
http://www.amazon.com/gp/product/B00KPXQQK0