CRDCsmart Bluetooth Speakers, Portable Wireless Speakers 2600mAh Rechargeable Battery 10 Hours Playing, Dual 3W Stereo 2 Channel Drive 4.0 Waterproof Speaker for Outdoor Sport MP3/4 Music Phone Call Dual 3W Power Audio - Stronger bass and higher quality sound. Perfect for travel, bicycle/Bike, cycling, climbing, camping, hiking, running, fishing etc outdoor sports use. Advanced Technology - Bluetooth 4.0 speaker system, connect your device in 3 seconds, outstanding connection range of up to 30 feet (10 meters) pairing for mobile phones, tablets, laptops. Durable Shell - Waterproof IP65, Splashproof, Shockproof, Dustproof with soft protective case. Loudest sound portable bluetooth speaker makes you enjoy music when in shower/outdoors/sports freely. How to Recharge - To charge the unit, simply connect the speaker to any active USB port or adapter using the USB charging cable. The speaker can be fully charged in around 4 hours. When fully charged, the red LED will turn off. Rechargeable Battery - Built in rechargeable 2600mAh battery, supports up to 10 hours playing time with a single charge. Built in high sensitivity MIC, 3.5mm Audio in Jack, connect the phone to answer and call the phone everywhere.