Powerful Sound Portable Splash Proof Bluetooth Speaker with Mount, Built-in Mic and Full Control Buttons for Bicycle, Troller, Scooter and More Use for any Smartphones, iPhone, Android, Tablets, Computers and any Devices with Bluetooth 3 Hours of Working Time | About 25-30 Hours of Standby Time -Built-In Rechargeable Lithium Ion Battery; via Micro-USB Cable (Included) Built-in microphone to answer calls with Answer, Play/Pause, Previous/Vol.down and Next/Vol. up Track buttons. Unique Splash Proof, Durable Aerodynamic design with Swivel head and Easy Screw Mount Frequency Range: 80Hz ~ 20KHz | Sound Output 2.0 Amplifier Output