inputs.text: impressive sound - really pleased sound output bluetooth speaker nice amount bass essential kinds music also liked solid heavier typical plastic cased speakers nonslip rubber ring bottom not slide around no issues pairing devices also successfully plugged mp3 player via 18 audio cable using micro sd card play music not know maximum size card use used 2gb sandisk micro sd card worked fine issue using sd card play music cannot select folders subfolders play songs order appear card skip thehem one time take ton music also built mic answer phone calls bluetooth mode used one phone call far said could hear fine great sound pretty good value would definitely recommend anyone looking portable speaker