The Studio+ Model comes with two additional support elements, refered to as "hands". Each hand has two suction cups.
 
The four extra contact points enhance the stability of the apparatus so that the player can move more freely around the instrument. 
 
AUX instrument support is built for electric or acoustic guitars, and can be used in standing and sitting positions.
 
The stand is sold separately from the AUX. 
 
This is great for players who want to play standing up, be able to switch between guitars easily, and for long practice sessions to help ease tension in the lower back and shoulders.