VHF Extension Speakers Surface Mount. Part Number: MB-21W. 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. D. 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)