Kecag Mini Portable CD Player Walkman Study and Repeat Retro MP3 Music CD Player 1. Material: ABS plastic 2. Motherboard solution: ALI 3. Support disc formats: CD, WMA, MP3 4. Support playback mode: CD playback 5. Frequency response: 100HZ-18KHZ 6. Rated power: 20MW 7. Audio interface: 3.5mm stereo plug 8. Shockproof function: CD-45 seconds MP3-120 seconds 9. Button operation: Yes 10. Memory function: Time and volume power-off memory 11. Signal-to-noise ratio: greater than or equal to 65db 12. Battery: No. 5 battery x 2 (battery not included in delivery) 13. Product size: about 140 x 140 x 30mm 14. Net weight: about 250g 15. This product is manually measured, and there may be an error of 0.1-0.2 mm and 0.1-0.2 grams in length and weight; there may be a slight color difference due to display and light problems. Please refer to the actual product! Packing list -DVD player x 1 -Headphones x 1 -USB-DC power cable x 1 -Instruction manual x 1