features Super Bass andproduces high-fidelity sound with BT 4.0 technology. You dont necessarily worry about abrupt interruption of the music thanks to long working time of battery. This BT speaker is a perfect combination of art and technology. Features: Environmental-friendly material: we specially choose coconut shell for it is environmental-friendly, hard and solid as well. Hand-free call: you can receive a call through this speaker even when you are listening to music and hold conversations through the built-in microphone, all done directly by the speaker. High-quality sound: the speaker adopts cutting-edge BT audio decoding chip: AC4603 --- you can enjoy an impressively crisp, crystal-clear sound and robust bass. Large transmission range: the BT 4.0 speaker makes it easily connect with any BT devices 10 meters far away, which supports in-put and out-put function, such as smartphone, tablet or laptop, etc. Extra-long working time: the rechargeable battery supports more than 36 hours of music playtime and can be fully recharged in only 2 hours. Ultra-portable design: only 12cm length and 12cm width respectively, it perfectly fits in your backpack. Besides, it comes with a lovely band, which can be hung, making it ultra-portable.