Alternating Pressure Pad and Pump System Akros AquaTherm Deluxe Variable Pressure Pump and Bubble-style Pad effectively reduces pressure. Automatic 5-minute cycle alternately inflates and deflates. Heavy gauge, medical grade vinyl is easy to clean, flame retardant and anti-bacterial. Pump mounts to bed with built-in mounting bracket and features an illuminated on/off switch. Deluxe variable pressure pump. 275 lb maximum weight capacity. 90-day limited warranty on pad. 1 year warranty on pump. 78 x 34 x 2.5 . AquaTherm 2000 Additional Specifications Power 120V 120 Volt/60Hz, 1 Amp Pressure 1.0 2.0 psi Air Output 4.5 liters/min Cycle Time 5 min. Power Cord Length 10 ft Pump Size 9 3/4 x 5 1/8 x 3 7/8 Pump Weight 2.5 lb Category Pressure Management Mattress Overlays Difference between the AQ1000 and AQ2000 AQ1000- is just a standard pump. AQ2000- comes with pressure control. pressure can be increase or decrease by rotating the knob This item ships from a separate warehouse and may require extra time for delivery.