Breville BES900XL Dual Boiler Semi Automatic Espresso Machine Dual stainless steel boilers and dual Italian pumps for simultaneous espresso extraction and steaming Over-Pressure Valve (OPV) limits extraction pressure Electronic PID temperature control for precise water temperature, plus actively heated group head and heat exchanger (HX) to maintain thermal stability Backlit LCD displays brew temperature, shot clock or time. Assists with programming shot temperature and volume, pre-infusion duration and power, and auto-start time Drop-down swivel foot lowers a wheel that lifts the machine upwards for convenient access to the water tank (both rear and top-fill)