Sony Walkman is very good product and it with pair with all music device directly.it is very good product.usb connection is very good quality.it will connect with mobile by otg directly and you can transfer files smoothly.this device do not support any virus it is very good product.this is my favorite mp3 player and I use very much this product .sound quality is very good quality and it is a good product . You have to buy this product at low cost.this is very good product and good qulity