MB21 2-1/2"" VHF Extension SpeakersNo more missed calls! These waterproof communication speakers can be mounted where you can hear your VHF radiotelephone, Available in black or white, Product : POLY-PLANAR MB21 (B) VHF EXTENSION SPEAKER Manufacturer : POLYPLANAR Manufacturer Part No : MB21B UPC : 731128002118 SKU: CW11236