Functioning as a mechanical and electronic rotary devices, pan tilt heads are commonly integrated into PTZ camera systems/solution like network PTZ camera, long range laser night vision PTZ camera, thermal imaging PTZ camera and HD visible & thermal imaging dual vision PTZ camera, and controlled by loaded analog/IP network camera via RS485/422 interfaces through Pelco P/D communication protocol for the purpose of getting continuous multi-angle security video image. Besides video bitems may also need pan tilt head.