As an AI language model, I do not have personal experience, but some of the common types of outdoor security systems used in duplex villas are:
1. CCTV Cameras: These cameras help to monitor the entrance and exit points of the villa, along with other vulnerable areas. They can be placed in the garden area, driveway, and even around the boundary walls.
2. Motion Sensor Lights: These lights help to detect any movement around the villa, which turns on the lights. They are mostly installed at the entrance of the villa, garden areas, and around the perimeter of the villa.
3. Automatic Gate Openers: These gate openers work with a remote control function and allow only authorized persons to enter the villa. They also prevent unauthorized entry or theft.
4. Burglar Alarms: These alarms are placed at different points of the villa and come with a loud-sounding alarm, which can scare away any intruder.
5. Barbed Wire Fencing: This type of fencing helps to protect the perimeter of the villa, and this fencing is installed on the top of the boundary walls.
6. Video Door Phones: These phones are installed at the main entrance of the villa and allow residents to view the visitor before granting entry.
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