MegaBoot Battery for Amazon Echo | Battery Base for Echo up to 18 hours | Use echo anywhere WORKS WITH ECHO FIRST GENERATION ONLY | The MOST POWERFUL BATTERY for Echo| Up to 18 hours of battery life with your favorite music playing | Smart fast charging around 4 1/2 hours | Only High Quality Cells (Not Chinese cells) For Echo Plus and Second Generation Echo Batteries go to--- &gt; https://www.amazon.com/dp/B07896YRSK BatteryBoot fits snug to bottom of Echo for easy handling | Clean design to perfectly match your Echo | Once attached you won't notice it Pat. Pend. #62271525 (c) 2015 | BatteryBoot | MegaBoot