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Midland 21-406 Deluxe Micromobile Extension Speaker for CB, Amateur, and Marine Two-Way RadiosThe Midland 21-406 is a high performance 8-ohm extension speaker. The 20-Watt extension speaker can be used with CB or Marine Radios with a 3.5mm speaker output. The bracket size is 3.25" x 1.25". It features a swivel base and includes a cable with a 3.5mm..