eHUB&reg; Portable 20 Watts Waterproof Bluetooth Speakers For Bike Riders & Outdoor Enthusiasts.Guaranteed 30 Hours of Playtime with 10000 mAh Rechargeable Battery.Shockproof, Dustproof, Waterproof! A bluetooth speaker that supports Wireless Music Streaming via New Bluetooth v4.1 Technology that can reach signal about 20 meters with no obstructions. Portable speakers with 30 hours play time and built-in rechargeable lithium battery Supported Formate of eHub wireless speakers bluetooth: WAV, MP3, WMA, FLAC | Easy to connect with computers, digital music players, cell phones and other audio devices With built-in microphone and hands-free calling feature so you can conveniently pick up a call anytime, anywhere. Easy to carry, only 620g Outdoor speakers with shock-resistant, waterproof, and dustproof design. With Loud Speaker Impedance of 4 and a Frequency response range of 100Hz-18KHz (11 feet) 100% SATISFACTION GUARANTEE - Shoppers Smart LLC warrants that the product above is in good condition, free from material or workmanship defects