Let your own weight do the stretch
Lie back. The pillow uses gravity to lengthen the neck. No motor, no plug, nothing to switch on.
For the stiff neck from a desk day
Use it at home after a day of looking slightly down. It is portable enough to move from the bed to the floor.
Neck and shoulders, together
Acupressure plus a gentle traction stretch, so you are not lining up three different tools.