... environment eroded by rain, snow and much dust for remote control of crane, electric block and other equipments.2. ... with good dustproof and rainproof performance.All the other buttons are with function of automatic reset and mechanical interlock ... COB61,COB61A, COB62, COB62A, COB63, COB63A, COB64 ,COB64A,COB65Production: Waterproof Remote Button Switch COB 62 COB 62A similar NP3 pushbutton switch