Rolton W405 Portable Mini FM Radio TF Card USB Receiver Music Player with LED Display 1. Output power: 3W 2. FM radio frequency range: 76MHz-108MHz 3. Working voltage: DC 3.7V 4. Charging voltage: USB input DC 5.0V 500mA 5. Lithium battery capacity: 1500 mAh (Battery not included) 6. Basic function: MP3 playback 7. Interface type: AV 8. Input voltage: AC 100-240V (compatible with standard USB charger) 9. Supported format: TF card 10. Speaker: 1.5 inches x 1 + passive radiator x 1 11. Playable formats: MP3, WMA, WAV 12. Audio device type: Card-based player 13. Speaker box material: Engineering plastic 14. Channel configuration: Stereo (2 channels) 15. Expansion interface: USB 16. Impedance: 4 ohms 17. Play time: Up to 8 hours 18. Extended storage support: Up to 32GB (via TF card) 19. Bluetooth version: 2.1 (if applicable) 20. Speaker effect: Enhanced stereo sound 21. Dimensions: 123 x 32 x 67 mm 22. Net weight: Approximately 158 grams Package Includes: - Device x 1 - Lanyard x 1 - USB charging cable x 1 - User manual x 1 - Certificate of conformity x 1