SINOBAND S400S Waterproof Power Bank Bluetooth Speaker with Microphone, Portable Outdoor Wireless Stereo Speaker with Upgraded 10 Watt NdFeB Drivers Deliver Superior Acoustic Feast, Bluetooth CSR 4.0 with NFC Function Compatible with Your Cellphone, Tablets, Pads, and All Other Bluetooth-enabled Devices, New Upgraded Powerful 7000mAh Polymer Li-ion Battery, 3.5mm Aux-in for Your Mp3 Player, Computer, Etc. With FREE Quality Custom Made Pouch Carry Case Double 5 watt enhanced vibration speakers deliver unexpected bass, the tenor is smooth and the treble is not that sharp like other 10 watt speakers, you will find a comfortable tune at any grade. 2.1 sound track deliver unexpected bass than 2.0, NdFeB magnet provide an efficient work and a long life time for the speakers. NFC function with: Built-in NFC and bluetooth CSR 4.0 chipset can easily connect to your NFC/BT capable devices, you just need to lightly touch your NFC device with the button on the speaker. Bluetooth 4.0 has a lower power consumption. 2 in 1 function: A USB port at the back of the speaker can be used as a power bank as well, and a battery status indicator can show the surplus power and get to know when you should charge the speaker, it combines listening with charging your devices the same time. Built-in powerful 7000mAh polymer lithium battery provides up to about 25 hours of playback time, you can enjoy the music for a rather long playback time even for the outdoor activities. SINOBAND S400S new packaging silicone housing that is waterproof, shockproof and dustproof, can be used as a shower speaker, and a metal hook at the profile can be easily carried with even when you are hiking or climbing (A microfiber carry bag included in the package).