What do these Bluetooth icons shown in iOS status bar mean? I have two Bluetooth speakers from the same brand. They both have a mic and a call answer button as well as media playback control.

When I connect to one of them I see the following icon in the status bar:



The other speaker when connected, shows the following in the status bar:




Why is a speaker represented by a headphones icon?
Why do the icons differ?
What are their respective meanings?
Does the absence of a battery indicator mean that the speaker doesn't report battery status?


I am using iOS 10.3.3.
Refer to the Apple Support document, Status icons and symbols on your iPhone:


  
  
  The battery level of your paired Bluetooth device.
  
  
  
  Your iPhone is paired with a wireless headset, headphones, or earbuds.