HOPESTAR A20 Pro TWS Portable Outdoor Waterproof Subwoofer Bluetooth Speaker with Microphone, Support Power Bank & Hands-free Call & U Disk & TF Card & 3.5mm AUX Features: 1. Wireless connection 2. Memory function 3. Support U disk TF card AUX play mode (U disk and TF card are not included) 4. Built-in lithium battery 5. Support hands-free call function 6. Support MP3 WAV WMA FLAC APE music format decoding 7. Use high-fidelity speakers to make the sound more natural and delicate 8. 1 + 1 serial function (TWS function) 9. IPX6 waterproof rating 10. Support power bank function 11. Equipped with an external microphone, which can be connected to speakers for K song activities Product specifications: 1. Wireless standard: Bluetooth 4.2 2. Transmission distance: 10m 3. Output power: 10W x 2 + 35W 4. Playing time: 4 hours 5. Frequency influence: 100Hz-10KHz 6. Speaker: 66mm x 2, 4 ohm, 10W; 102mm, 4 ohm, 35W 7. Input power: DC 5V, 2A 8. Current consumption: up to 1A 9. Battery type: 18650 lithium ion 10. Battery capacity: 6000mAh 11. Audio signal input interface: 3.5mm 12. Power bank function: 5V, 1A