SHARKK MAKO Waterproof Speaker 20 Watt Wireless Bluetooth Speaker with Maxbass Technology Portable Speaker with 4400mAh Battery Power Bank SUPERIOR STERO SOUND - This is the best bluetooth speaker in its range with Advanced Maxx Bass Technology, featuring powerful 20W Waterproof Bluetooth Speakers ADVANCED CONNECTION CAPACITY with Bluetooth 4.0, NFC Functionality, and an AUX port. Specifications: 4400mAh Battery, Charging Voltage: 5V, Battery voltage: 7.4V, Audio Cable: 3.5mm Package Includes: Sharkk Mako 20W Water and Bluetooth Speaker, Audio Cable, USB Charging Cable, Power Adapter, and User Manual IP67 WATERPROOF WIRELESS SPEAKER with additional features including Siri and S-Voice support, Hands free calling with microphone, LED Power / Charging Status indicator, and LED button back lights activated by thermal sensor