Since 1954, the 4′ x 6′ Model 64 booth has been our best selling unit. Small enough to be economical, accommodating in situations where space is at a premium, and yet large enough to be used for around the clock security or parking operations. The possible modifications to this unit are unlimited. This one included some of our most popular: a second door, HVAC system, transaction windows, tinted glass and accessories associated with needed parking or security equipment.