Product ID: GC258FF. DB25 to RJ45 Modular Adapter - F/F. Convert a DB25 male connector to an RJ45 female connector. 1 - DB25 to RJ45 Serial Port Adapter. 1 - DB-25 (25 pin, D-Sub). Although quite a number of manufacturer have adopted the 100-240v (autovolt) power, still a large number of electronics devices may still be mainly 110v.