Speaker:Build-in speaker Standard:5V 1.5A Type:Li-ion 3000mAh Sound record:MIC record: build-in WAV record SystemCPU:Rockchip2729Interface:USB Port,TF card, Earphone, DC jackData transmission:supportMedium:TF cardCapacity:4GExpend storage:TF,Maximum 32GB supportedscreenPanel size: 7" digital screen, 16:9Features:Resolution: 800(H)×480(V) FunctionReader formats:TXT,FB2,PDF,PDB,EPUB,SKT,HTML etc. ...