Ultra-Compact MicroUSB-to-USB OTG Adapter Use regular USB devices such as USB flash drive, mouse and keyboard on smartphone/tablets with MicroUSB port that supports USB-OTG. USB 2.0 type A receptacle and MicroUSB 2.0 plug. USB 2.0 standard, backward compatible with USB 1.1. CE & RoHS compliant. 2-year limited warranty by Meenova.