Exit Push Button 1.NF-20(Stainless steel), 2.Mechanical Life: 1000000 tested 3.Current Rating: Max Exit Push ButtonNF-20(Stainless steel ... Warranty for one year, maintenance forever, change within 3 months be cause of product quality. Except for ... ,electric bolt and electric strike are 2 years, exit button, bracket , and power supply will be 1 year ... under other conditions Access Control - Exit Button