Features: Plugs Play USB Design : Features a built in USB plug for directly connection to computers without cables, making charging and music transfer quick and convenient. Battery Powered operating : Uses standard 3a batteries for power supply, ideal for outdoor activities and travel with easy battery replacement for unlimitedly playback time. Clear Display Screen : Equipped with an easy to read display showing song titles, playback progress, and battery display for user friendly operating. Expandable Card Slot : without internal memory but supports external cards, allowing flexible storage expansion to suit your music collection needs. Support Card Reader Function : Doubles as a memory card reader for fast and stable file transfers between devices without additional accessories. Specifications: Component: ABS Technology: Economical and practical design, button operating Power supply: Need 3a battery power supply (need to bring your own) Size: 9.5x3cm/3.74x1.18in Color : black/blue/silver/red Usage: daily music playback｜portable storage Memory: Without Memory （can insert card your own） Package Includes: 1PC MP3 music player note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution