Bluetooth Speakers: Zero-One Audio SOLO PP Portable Wireless Speaker, 18 Months Warranty, NFC, High-Definition Sound Quality with 20 Hour Playtime for Outdoors / Indoor Entertainment Full and High-Def Sound Quality: Hi-Fi comparable speaker engineered with 3D dynamic sound technology, hundred times of tests to find suitable material for cone diaphragm. Conex for damper, standard woofer structure in super thin body, ensure high definition sound from this mini cube. Fine crafted aluminum body, unlike the plastic body used in similar product, aluminum body eliminates speaker body resonance and helps to transmit high quality sound. Long Playtime, Fast Recharge: With 1800mAh built-in Lithium-Polymer battery, you can enjoy 20 hour of non-stop music at 80% volume, three times longer than similar-sized portable speakers. Recharge in just 3 hours using the original ZOA Micro USB cable. Ultra Compact: This ring box-sized Bluetooth speaker fits easily into your jacket pocket or the small side pocket of your backpack (50mm / 1.9in, 115g / 4oz cube). Broad Compatibility: Quick pairing through Bluetooth or NFC with iPhone, iPad Mini, iPad 4/3/2, iPod, Blackberry, Nexus, Samsung and other popular smartphones.