This an ebook reader designed for android users, it currently supports opening EPUB, CHM, TXT, UMD and HTML files. Small tips: You may use volume up/down buttons to navigate between pages, if you think using the menu items is cumbersome.Please contact me first before leaving any negative feedback since I care about user satisfaction and will try my best to solve problems for you. Sometimes it may just be a problem related to the phone, not the app. Thanks.