Most compelete, one-stop AHD solution,only in QIHAN! 1.AHD Camera： 720P, 1080P, Bullet, Dome, Indoor, Outdoor. 2.AHD DVR： 1080P, 1080N, 4CH, 8CH, 16CH, Audio, Alarm. 3.AHD PTZ :   720P, 1080P, 4'', 6'', 7'',12X, 22X, 37X. More surprises are coming...