VHF Extension Speakers Surface Mount. Part Number MB-21B. This compact marine communications speaker includes a stainless steel mounting bracket and stainless steel grill. 8 watts Maximum handling power. Comes equipped with a 10' lead wire and mini-plug. These waterproof communication speakers can be mounted where you can hear your VHF radiotelephone. Features. Completely waterproof and corrosion-proof. Features stainless steel grills, sturdy plastic frames, polypropylene speaker cones and teflon-coated wires. Ideal for use as a VHF remote. Available in black or white color speaker. Specifications. Peak Power Handling 16W/pair. Speaker Impedance 4 ohm. Frequency Range 1K to 10K Hz. Weight 0.35Lb per Speaker. SPL 83 dB /-3 dB. Overall Dimensions 2-15/16 x 2-3/4 x 1-5/16 74mm x 69mm x 33mm Part Number MB-21B. This compact marine communications speaker includes a stainless steel mounting Features stainless steel grills, sturdy plastic frames, polypropylene speaker cones and teflon-coate Peak Power Handling 16W/pair Speaker Impedance 4 ohm Frequency Range 1K to 10K Hz