YISCOR Wireless Bicycle Climbing Sports Outdoor Bluetooth 4.0 Stereo Speaker Waterproof Shockproof Portable Audio Sound, Making Calls and NFC Enabled Speakers 3.5mm Audio Jack- RED UP TO 10Hrs Playback: It has a built-in 3600mAH battery, which can last for up to 10 hours on a single charge. This speaker can also be used as a power bank, when go hiking, climbing and other activities, there is no need to worry about cellphone running out of power. The size may be small but the built in battery lasts for up to 8 hours on a single charge. Or plug the speaker into a wall charger or computer with the included standard size micro USB charging cable and play through the night. Make Hands-free Calls: Use the built-in microphone with Clear Voice Capture to make and answer calls on your phone or have hands-free web enabled conversations using your tablet or computer. Great when you need to bring more friends and colleagues into the conversation. Top CSR 4.0 Bluetooth chipset Bluetooth 4.0 Technology and NFC enabled makes it connective to all Bluetooth and NFC enabled devices, equipped with a 3.5mm audio jack for non-Bluetooth devices. Waterproof And Shockproof: When suddenly it is raining, you don't need to put the speaker into your bag in case it gets broken. This speaker is also shockproof, when it collides some hard surface, the silicon case can protect the inside parts from breaking down.