The Empire Bamboo Wireless Speaker with 5W Wireless Charger is a powerful fabric covered speaker with a genuine bamboo top that functions as a 5W wireless speaker with woofer. It has Foreign Object Detection functionality and a built-in NTC temperature sensor protects from overheating. Speaker must be plugged in with the included USB or USB-C charging cable for wireless charging. The 1200mAh/3.7V battery has a playing time of 4 hours and charging time of 1.5 hours. FCC Certified.