Worlds Smallest Coin sized Speaker Full, High-Def Sound: Enjoy an impressively full sound quality and robust bass realized through audio driver and passive subwoofer. Long Playtime, Fast Recharge: Enjoy hours of music, up to three times longer than similar-sized portable speakers. Recharge in just 1 hour using the included Micro USB cable. Incredibly Compact: This ring box-sized bluetooth speaker fits easily into your jacket pocket or the small side pocket of your backpack Complete Compatibility: Pair smartphones, tablets, laptops and more via Bluetooth (up to 10 meters / 33 feet) Built-In Microphone for Hands-Free Speaker Phone Calling, Environmental Friendly Rechargeable Battery, Super Bass and surround Sound, dolby trueHD, Selfie Remote Shutter.