Feature: 1. Powerful Sound Quality: Unique MDF resonance box, fully enclosed cavity, built in high sensitivity pick up module, the sound is more pure, strong and powerful. 2. Stable Transmission: High speed BT chip, providing 10m/32.8ft of efficient and stable transmission, dual speaker design, with heavy bass output. 3. Built In Microphone: A talking BT speaker with built in microphone function, after connecting the speaker, you can chat freely without a mobile phone. 4. Rechargeable: This speaker has a built in 2000mAh battery, about 4 hours charging time, and when fully charged, it can last for about 10 hours of playback. 5. Compatible: Support Memory Card, USB, Aux and MP3 multiple input methods, compatible with smartphones, laptops, PCs, etc, to meet the use of different scenarios. Specification: Item Type: BT Speaker Material: MDF Frequency Range: 90Hz-20KHz SNR: >60dB BT Protocol: 4.0 Support: Memory Card, USB, Aux, MP3 Built in Polymer Lithium Battery: 2000mAh Continuous Playback Time: Up to 10 Hours Charging Time: About 4 Hours. Package List: 1 x BT Speaker1 x Charging Cable1 x Sound Cable1 x Manual