... 4. OEM 42 inch Wall mounting Digital Equipment, digital advertising equipment, digital signage equipment, restaurant serving equipments Key Function1.Upgrade contents ... screen, network (3G, WIFI, Rj45) optional Main Function1.Play mp4 advertising video, mp3 music and digital photos; Built- ... supermarket shelves, tabletop, showcase and lift, etc.;2. Play from:--Compact Flash card (CF card)/ SD/ MMC--USB ...