Item Type: Back Clip MP3Material: ABSBuilt in Battery: Li Ion Battery 90mAhSmall Memory Card: Supports Up to 8G (not Included)Package List1 x Back Clip MP31 x Charging Cable1 x Headphone1BACK CLIP DESIGN: Music player is designed with a back clip, you can attach it to your clothes or equipment, convenient for you to use when you travel and also when you exercise. 2MEMORY CARD SUPPORT: MP3 player has a memory card slot, it supports expansion up to 8GB, you can use the memory card to store more music. 3PORTABLE: Back clip player is light weight, small and easy to carry, it doesn't take up much space and can be worn when you are out and about. 4LONG WORKING TIME: Back clip MP3 battery life is long and can work up to five hours, so you don't have to worry about running out of power when you go out, and it's more convenient to use. 5DURABLE MATERIAL: MP3 music player is made of premium ABS material, with guaranteed quality, long service life, durable and not easy to damage, making your life better.