MARSEE S7730 Waterproof Bluetooth Portable Speaker,Hi-Fi NFC & CSR 4.0 and 10W IPX5 Water Resistant Shower Speaker with Power Bank 5200 mAh Build-in microphone and rechargeable 5200mAh Battery Lasts 18 Hours play,also this Portable Speaker is a 5200mAh Power Bank IPX5 WATER RESISTANT,rainproof, dustproof, sandproof; outdoor shower speaker, perfect for the beach, poolside, boat & golf cart HIGH QUALITY CRYSTAL CLEAR SOUND distinct mids and highs from our two precision acoustic drivers delivering 10 Watts of excellent stereo sound and enhanced bass from our proprietary passive subwoofer design. NFC (Near field communication,and if your bluetooth audio device has NFC function) technology for easy and instant connection. Bluetooth 4.0 and CSR chipset connects faster, more stable, compatible with all your Bluetooth-equipped devices. 10 Watts of total output power driven by two 40mm drivers and a massive passive radiator for incredible sound quality to take sound everwhere you play