SINOBAND S400 Waterproof, Dustproof and Shockproof Portable Stereo Power Bank Bluetooth Speaker in Black, Bluetooth CSR 4.0, with FREE Quality Custom Made Pouch Carry Case, Compatible with Smartphone, Tablets, and Other Bluetooth- Capable Devices, Super Bass Releases Hi-fi Sound, Powerful 7000mAh Polymer Lithium Battery. SINOBAND is the ONLY legal manufacturer of the S400 speaker. You can see the clear brand name on the speaker, dont believe those plagiarists who even have no clear logo on the speaker. Do not be fooled or overcharged, buy only the ORIGINAL. Jaw-dropping Sound Quality and Volume, it will deliver the rich bass and sound quality that you crave. Super bass and high high-fidelity audio, enjoy the music at all frequency with pleasure. New 2 in 1 function. Powerful 7000mAh built-in polymer lithium battery provides up to 20 hours of playback time, a standard USB jack can be used as a power bank, that you can enjoy your music the same time power your electronics. Be careful, the original SINOBAND battery is 7200mAh, not 5200mAh or less. The play time also tells the big difference(Another way to differentiate the counterfeits). Advanced Bluetooth 4.0 Technology and CSR chipset connects faster, more stable, compatible with all your Bluetooth-equipped devices, and an excellent Bluetooth range about 49.2 feet so you can control your music in an appreciable distance, such as the open-air yard. Built-in noise reduction microphone and additional speakerphone function free your hands for the phone calls.