Features: 1) Easy for window installation 2) Time saving 3) Mighty magnets are nickel plated to protect from chipping and corrosion 4) Available in closed loop 5) Standard gap: 1/2+, 1 for BR-1012DMWG 6) Longer leads and zip cord upon requests 7) Built-in resistors and diodes available upon requests 8) Switch or magnet available separately 9) Big magnet is available 10) UL, CUL and CE approved