Must be PRC-standard “Watts”; 2-3 hours of continuous music; Output Power: 3W; Battery Capacity: 3.7V, 500mAh
With a 3.7V / 500mAh battery, it has a MASSIVE 1.85W-hr of energy. So even if it was running at 2 Watts, it wouldn’t even make it an hour.
TL;DR, the “400W” spec is only off by a factor of about 200x. In reality, it’s probably 400mW.
This purchase was NOT rad. These are speakers from HELL!! After the charming and entertaining announcement that I have blue-a tooth-a connection-a, I get about 6.8 minutes of connection time and then the *&^% thing disconnects and requires that I restart whatever i was hoping to enjoy.