RawGear RGBSBK Portable Wireless Bluetooth Bicycle Speaker, Red Play Music & Make Calls Via Bluetooth Splash Proof, Durable Bluetooth Speaker | Tightly Attaches to Bicycle Frame Adjustable Volume | Play/Pause Buttons | Comes with a Built-In Rechargeable Lithium Ion Battery; via 3 Hours of Working Time | About 25-30 Hours of Standby Time Frequency Range: 80Hz ~ 20KHz | Sound Output 2.0 Amplifier Output