DOSS PowerBox Bluetooth Speaker, Born for Amazon Echo Dot, Portable Wireless Bluetooth 4.0 Speakers with HD Sound and Booming Bass, Long Playtime for iPhone, iPad, Samsung, Tablet-Black Designed for Amazon Echo Dot : free your Amazon Echo Dot,consummate combination for a flexible lifestyle, easily take it anywhere indoors or outdoors to enjoy wireless freedom. Bluetooth 4.0 Technology: compatible with all Bluetooth-enable devices that allows you to instantly connect to your smart devices, and it can automatically reconnects to the last device used. Superior Sound Quality: enjoy your music with stereo sound, which powered by 2x10W high-performance drivers, enhance the sound of your Echo Dot to bring an extraordinary listening experience. Easy to Use: simply put the Amazon Echo Dot into the top of PowerBox, use Amazon Echo Dot micro-USB cable to Power and Charge, and say goodbye to complex program settings. Extended Playtime: enjoy up to 8 hours of portable playtime, with 2200mAh rechargeable lithium-ion battery, no longer worry about the power deficiency, satisfy your obsession with music.