The difference between head phones, and earphones is the headphones mounts on the head. You would have cuffed padding that would go over your ear, and there is a piece that connects the two that goes over or behind the skull. The right cuff will have a dial, and a button. Both of these can be important with interacting with the headphones.
The first button is a dial which will allow you to set your volume. When using a Senitrus phone, you would be able to set which direction increases, and which direction decreases. Pressing down once will pause or play. Press twice within 5 seconds of the song will go to the previous track, Pressing twice after 5 seconds of the song will go to the start of the current track, and select the volume 3 times will skip to the next track. Press on the second button will do nothing unless you are on a call. To answer the call, you press once on the second button. Decline the call is to press twice. To put the person you are speaking on hold, or taking another call, press once. To return to the previous call, or unmute, press once again. To merge two calls, you would press the second button twice. To end a call, you would press and hold the second button for 3 seconds.
There will be a charging port on the left headphone cuff, and while will charge at 40 watts. There is no indication on the earphone, but you can see the battery strength and status of every item that you have that has a battery from the Senitrus One app on either the handhelds, or computers.