Feature 1. Portable detachable and adjustable shoulder strap up to 120cm long. 2. Mesh cover for protect speaker from water, dust, shock. 3. IPX5 waterproof, dustproof, shockproof. 4. 20W*2 big power with two ba diaphragms on each side, vibrate when playing music. 5. Cylindrical shape and built-in left and right channel offer 360 stereo. 6. Call function, noise canceling microphone makes you answer calls without reaching your phone. 8. Support MP3, WMA, WAV, FLAC, APE format music files. 9. Support TF Card or misro SD Card up to 32G, support USB 2.0 Disk. 10. Support external MP3 / MP4 / computer and other audio input function (AUX) 11. TWS function, you can conncect two speakers with one phone sync. 12. Easy button control, you can pre buttons to turn on/off, play/pause, switch mode, skip songs, adjust volume etc. 13. Bluetooth 4.1, compatible with all Bluetooth devices. 14. 3600 mAh battery for up to 10 hours of playtime at 2/3 volume on a full charge. 15. It's not only a bluetooth speaker, but also a radio, a wired speaker, a ba boom box. Specification Bluetooth version: 4.1 Bluetooth distance: <33Ft U disk input, 3.5mm audio input Extended memory: 32G(Not included) Battery capacity: 3600mAh Charging Time: 2.5-3.5 hour Listening/Talking time: 10-12 hour Waterproof level: IPX5 Charging parameters: 5V Frequency response: 70Hz-20KHz Signal to noise ratio: 90dB Distortion rate: <0.1% What we offer Portable Bluetooth Speaker*1 Adjust Shoulder Strap*1 USB Cable*1 Audio Cable*1 .