Features:1) Easy for window installation 2) Time saving3) Mighty magnets are nickel plated to protect from chipping and corrosion4) Available in closed loop 5) Standard gap: 1/2"+, 1" for BR-1012DMWG6) Longer leads and zip cord upon requests7) Built-in resistors and diodes available upon requests8) Switch or magnet available separately 9) Big magnet is available10) UL, CUL and CE approved producing area:China payment:T/T in advance supplying capacity:350,000pcs/month