This handset has adjustable volume,a pushbutton to talk and a belt clip.Push thr top button to pick up and hang up.press the side button to talk (which lowers the incoming audio) and roll the side to change the volume.

Featurs Included :

Measures 3inches long x 2.5 inches wide.
ABS plastic.Requires 2AAA batteries (not included in ur Package) .
Plug into your phone with a 3.5mm headphone jack.

Source Perpetualkid