P65 is designed to be the successor of DESY's three former bending magnet EXAFS beamlines at DORIS III. It provides a relatively large beam (1x1 mm²) and a moderate photon flux density. The 11 period undulator delivers a monochromatic photon flux of more than 10¹¹ s^-1. Two plane mirrors with variable angle of incidence and three different surface coatings are installed in front of the water cooled double crystal monochromator. They reduce the power load density on the first DCM crystal and effectively suppress the contamination of the monochromatic X-ray beam with higher harmonics radiation.