ZEALOT S24 Portable Stereo Bluetooth Speaker with Lanyard & Mobile Card Slot Holder, Supports Hands-free Call & TF Card 1. Bluetooth 4.2, strong resistance to dry picking, fast and stable, effective transmission of 10 meters. 2. The stereo sound cavity structure is equipped with a low-frequency radiator to form HiFi stereo, which makes the sound quality dynamic. 3. Built-in sensitive microphone, support Bluetooth mobile phone hands-free calling, HD noise reduction, mobile phone calls and voice chat as clear as face-to-face, free hands. 4. Symbol button, intuitive and simple. 5. Built-in large capacity lithium battery for up to 12 hours of playback. 6. The phone card slot bracket is safe and practical, and enjoys the cinema sound when watching movies. 7. Adjustable nylon strap for easy carrying and loss prevention. 8. The whole machine ABS is supplemented with the skin-friendly rubber oil process, which is fine and smooth. 9. The round body, the middle ring is hollowed out, and the shape is smart. Product specifications: 1. Bluetooth version: V5.0+EDR. 2. Transmission distance: about 10 meters. 3. Battery capacity: 2000mAh. 4. Charging time: about 3 hours. 5. Play time: 12 hours. 6. Full power standby time: 6 months. 7. Charging voltage: DC 5V. 8. Working voltage: 3.7V. 9. Signal to noise ratio: greater than or equal to 85dB. 10. Speaker: 4 ohms. 11. Frequency response: 20Hz-20KHz. 12. Distortion: 1%. 13. Weight: 230g. 14. Size: 120x118x37mm. Packing list: Speaker x 1 Instruction manual x 1 Charging cable x 1