AuPolus Waterproof Sport Speaker Captain Wireless Stereo Bluetooth Outdoor Speaker,Dustproof Shockproof Bass Subwoofer Sound Speaker 2 in 1 Function with 3600mah Power Bank/ Mic / NFC Support Waterproof, Dustproof, Anti-scratch, Shockproof, High temperature Resistant Speaker, waterproof grade IPX54 that is not available to totally immersed into water Stylish and exquisite appearance, which is convenient to carry,With it you can enjoy music anytime and anywhere Features Near Field Communications (NFC) technology which allows for easy, one-touch pairing by simply tapping your NFC-enabled Bluetooth smart device on the speaker Bluetooth 4.0 and CSR chipset provides range up to about 30 feet. HiFi and clear loud sound output, Built in microphone allows you to answer calls while listening to music Built-in 3600 mAh polymer lithium battery, Quick charging with 12 hours playback. A standard USB jack can be used as a power bank which can charge your phone or other device in emergency