Waterproof, Shockproof, Heat Resistant, Impact Resistant. 10 Hour Playtime, Ultra-Portable Bluetooth Speaker V4.0 with NFC, 3600 Mah Li-ion Battery, Power Bank, Ultra Bass Subwoofer / Built in Mic for Calls / NFC Function / Works with All Iphones and Ipads, Ipods /Samsung Galaxy Phones & Tablets / Laptops. IPX4 Waterproof, Dustproof, Anti-scratch, Shockproof, High Temperature Resistant Advanced Bluetooth 4.0 Technology- Ultra-optimized version of Bluetooth that consumes less energy and delivers crystal clear sound. Passive Subwoofer and 10W of power make it easy to enjoy soaring highs and deep booming bass, wireless and cord-free. Extremely light and Portable, it comes with a handy carabiner to attach it easily to your backpack. Bluetooth and internal microphone makes talking on the phone easy and clear. Reverse Charging Of Mobile Devices Via USB Port. Excellent for listening to music indoors or out, from the shower to the office, or from the city to the country the PT-390A is excellent in any environment.