... psychology barrier 3,Prevention physical, electrical perimeter electric fence resist invade effectively. 4, Alam: intruder break in ... ,microwave, the electrostatic induction ,all insulators of perimeter fence are waterproof design, enlarge crawling electricity distance, guarantee ... the working mode clearly. 12. Equipped with 4AH backup battery, convenient management. 13. Constant open/close, DC12V, RS ...