Analog cameras for DVR systems wired with coaxial cable, a good choice when upgrading an older installation. Most are Hikvision Turbo HD bullet and turret cameras from 2MP to 8MP, including ColorVu models that give a color picture at night, Smart Hybrid Light and motorized varifocal models, plus UniView Color Hunter and dual-light bullets.

Tip: check that your DVR supports the camera's resolution before upgrading to 5MP or 8MP.