... 4. OEM 42 inch Wall mounting Digital Equipment, digital advertising equipment, digital signage equipment, restaurant serving equipments Key Function1.Upgrade contents ... (3G, WIFI, Rj45) optional Main Function1.Play mp4 advertising video, mp3 music and digital photos; Built-in 42 ... , hence more durable and suitable for long-hour advertising playing 6.Touch screen for optional 7.Theft-protection ...