Wireless Bluetooth 4.0 Speakers Waterproof IP54 Sports/Outdoor/Shower Portable Bluetooth Speakers with Built-In Microphone Hands-Free Speakerphone for iPhone/Android phone [Green] Equipped with the advanced Bluetooth 4.0 technology - compatible with all Bluetooth-enabled devices (Bluetooth V2.1 and over). Connect your device in 3 seconds, outstanding connection range of up to 33 feet Three Proofings - Unique rugged square design with waterproof & Shockproof & Dustproof make it suitable for shower and outdoor sports, such as camping, hiking and biking Built in rechargeable battery - Enjoy 8 hours of music at 80% volume, up to three times longer than similar-sized portable Bluetooth speakers. Full recharge in just 3-5 hours using the included Micro USB cable Easily to carry with  Lightweight, only 12.8 ounces. The size is 68*58*198mm, with the hook, you can hang it from your backpack while hiking