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 adapter) 9. Supported storage: TF card up to 32GB 10. Speaker: 1.5 inches x 1 + passive radiator x 1 11. Audio formats supported: MP3, WMA, WAV 12. Audio device type: Card-based player 13. Speaker box material: Engineering plastic 14. Audio channels: Stereo (2-channel) 15. Expansion interface: USB 16. Impedance: 4 ohms 17. Play time: Up to 8 hours 18. Dimensions: 123 x 32 x 67 mm 19. Net weight: Approximately 158 grams 20. Bluetooth version: 2.1 21. Sound effect: Simulated 3D surround sound Packing list: 1. Device x 1 2. Lanyard x 1 3. USB charging cable x 1 4. User manual x 1 5. Certificate of conformity x 1