1.Outdoor for campingSupport power bank supply power.Take cinema anywhere you go 2.Synchronize Smartphone Screen byWired Connection 3.Can connect with external headphones or stereBuilt-in speaker 4.Wire Screen Mirroring Use smartphone original data cable to connect with projector to realize screen mirroring function.(Support iOS&Android system.No need extra cable.) 5.YT200 adopt environmental protection ABS Plastic,free ofpeculiar smell,eliminate industrial pollution protect you andyour family health.