The GoFor2 USB OTG Card Reader works with select Android mobile devices as well as PC and Mac systems. The GoFor2 is the perfect companion to your OTG compatible Android smartphone or tablet, as it can be used with an SD or microSD card to increase the storage capacity of your mobile device. The GoFor2 also serves as a card reader for easy file transfers between your SD or microSD card and your mobile device or computer without the hassle of driver downloads or upgrades. SD/microSD USB OTG Card Reader. Works with OTG compatible Android 4.0 devices including Galaxy S4, Galaxy Tab 3, etc. Perfect for adding storage or transferring files between computer and mobile device. Works with PC/Mac computers. Supports SDXC and microSDXC cards up to 64GB (32GB in OTG use). Micro USB connector allows OTG use and standard USB connector allows PC/Mac use. Plug-n-Play.