VIYAO Portable Bluetooth Speaker Shockproof Dust-proof Water Resistant Speaker Long Time Battery for Outdoor Sport Hiking Compatible with Any Bluetooth device-(Army Green) Ultra portable: Only 7.35 ounces, Just 1.77 inches tall. Designed to be comfortable to carry with hand strap, so much better for travel & hiking, superlight and easy to fit in your backpack. High quality:Shockproof, Dustproof, Water Resistant Extraordinary Sound:Rugged and enduring design with the best bi-directional sound quality for its size achieved through a 3W driver and passive subwoofer - listen to high fidelity music when you are out hiking, camping or partying in the wild Daylong Playtime: High capacity battery that can provide up to 12 hours of endless music, even at 80% volume! The Bluetooth speakers outdoor model can be recharged in just 3 hours with the included Micro USB cable! That's much faster than other outdoor wireless speakers Advanced Bluetooth Technology:The speaker can be used with most Bluetooth equipped smart phones, tablets, computers and audio players. Perfect if you have an iPhone, iPad or Samsung smart phone