You can purchase a digital video recorder, or DVR, separately, but most complete systems are sold with a recording device. Expect to receive either a DVR or a network video recorder with wireless systems. Typical security camera placements include entry doors, off-street windows, porches, stairways, driveways and interior common rooms. Many people make the mistake of beginning their planning after they have already purchased a security system. Instead, start with a security checklist and an ass...