Icolver Bluetooth Bicycle Speaker,Outdoor Waterproof Wireless Bike Bluetooth Speaker FEATURES-waterproof, dustproof, anti-scratch, shockproof, rechargeable, suitable for outdoor sports. DESIGNED FOR-Mobile phones/Apple products/Mp3/Mp4/Kindle/Tables and more. BLUETOOTH ENABLED DEVICES-hand free mic, speaker controls, Built-in Mic. DISTANCE TO CONNECT WITH YOUR DEVICES-within 10m. BATTERY CAPABILITY-rechargeable built-in lithium battery 3.7V, 400mAh, which offers up to 3 hours playing time.