Small TWS Couplet Wireless Bluetooth Speaker Mini Smart Noise Reduction Waterproof Speaker Features: 1. Six times shocking and lossless high-quality sound, coaxial copper core technology, dual speakers sound simultaneously 2. Bluetooth remote control camera, 360-degree surround sound effect, DSP high-definition intelligent noise reduction 3. Mini size, does not take up space, easy to carry 4. Built-in noise reduction microphone, clear sound quality, high-definition noise reduction 5. Support dual TWS interconnection to form a stereo surround sound effect Product parameters: 1. Material: aluminum alloy 2. Functions: Bluetooth, call, TWS couplet, remote control camera, waterproof 3. Bluetooth: 5.0 4. Connection range: 10 meters 5. Frequency response: 20Hz-20KHz 6. Signal-to-noise ratio: 70db 7. Channel mode: mono + single diaphragm 8. Speaker specification: 28mm, 4 ohm 3Wx1 9. Diaphragm specification: 25mm 10. Battery capacity: 200mAh 11. Playing time: 2-3 hours 12. Charging time: 1 hour 13. Product size: 3.4 x 3.4 x 3.2 cm 14. Product net weight: 34 grams