FDM-1 is a standard-sized dual monitor module used to monitor and supervise two independent two-wire Style B (Class B) dry-contact initiating device circuits (IDCs) at two separate, consecutive addres
Economic introduces a bi-directional projection speaker model HN-PBM20A/ in strong plastic cabinet and metal grille. It is 20W, cost-efficient speaker, provides high sound output in a wider area. it i