The LokSound by ESU Rectangular Speaker with Enclosure is ideal for use in N, TT and small HO Scale model locomotives. This speaker includes a built-in enclosure to enhance its output and is rated at 8 Ohms and 5 Watts. At only 11/32 x 1/2 x 1/8′ 9 x 13 x 3mm, this tiny speaker will easily fit inside widely used narrow-hood diesels such GPs, SDs, GE U-Boats or GEVO diesels as well as other locomotives. Check out the line of ESU speakers to fit your sound projects.WARNING: This product can expose you to chemicals, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov