IPX7 Waterproof Bluetooth Floating Portable Speaker Clear Sound and Heavy Bass for a Dynamic Sound Effect Wirelessly Stream Music from Any Bluetooth-enabled Device Such as Your Smartphone, Notebook, iPhone, or iPad Completely Waterproof, Sandproof, Everything Proof Built-in Lithium Rechargeable Battery: 1500mAh Lightweight Speaker Floats While in Use Control Music Playback Directly from Speaker Rechargeable Battery Lasts for Hours Built-in Microphone to Take Phone Calls Carabiner Hook Included for Easy Portability Bluetooth Version 2.1 Charging Voltage: DC5V Battery Working Voltage: 3.7V Charging Time: 5hr. Charging Port Type Micro USB Battery: Talk Time 20h Battery: Standby Time 110h Battery Capacity 1500mAh Watts per Channel 5W Driver Size 2 inch Frequency Response: 100 Hz &18 K Hz Nominal Impedance (Ohms) 4 Ohms Waterproof level IPX7 Dust Ingress Resistance Level 6 Accessories: User Manual