You get two Viair 444s, two relays and a 165-200 psi presure switch. 

Single Viair 444 Chrome

 5 Gallon Tank Fill times:

0-200 psi 5 min. 30 sec.

165-200 psi 1 min. 35 sec 

Max Working Pressure: 200 psi

Duty Cycle: 100%

Dimensions: 10.87"L x 4.2"W x 7.06"H