Automatic Retractable Bollards: Our Bollards are powered by 12V batteries trickle charged via low voltage current. Available in various security levels, Parking Sentry Automatic Bollards do not require the complex installation of underground hydraulic plumbing, pneumatic hose networks, or high voltage lines or external power units or compressors. Each of our bollards is an environmentally-sealed, self-contained, fully-functional, integrated unit that can be deployed individually or in sets.Parking Sentry Automatic Bollards are easy to install and maintain, reliable and secure, environmentally friendly, and cost effective.We also offer architectural quality, precision engineered removable bollards that can be custom designed to your specifications. We offer the option of a consistent look across bollard types: automatic, removable, and permanent.In addition to bollards, we also provide Parking Sentries - remote controlled devices for preventing poachers from squatting in your private, reserved parking spaces.