JUSTNEED TWS Waterproof Bluetooth Small Speaker, Built-in High-definition Microphone, Support hands-free Call 1. Connection method: Bluetooth connection 2. Interface type: USB 3. Battery capacity: 850 mAh 4. Frequency response range: 75Hz-18.5KHz 5. Output power: 5W 6. Signal to noise ratio: >80dB 7. Dual mode resonance: medium and high frequency dual speakers + independent dual diaphragm 8. The bottom of the speaker is equipped with a powerful rubidium iron boron magnet, which is 64 times the traditional magnet. It is used in modern high-tech fields such as artificial satellites, magnetic levitation, and aviation instruments. 9. Compatible with most devices with Bluetooth on the market, mobile phonestabletsnotebooks, etc., easily connect, allowing you to put aside the shackles of wired and enjoy wireless fun