VHF Extension Speakers Flush Mount Single. This thin, dual cone waterproof communications speaker with 20 watts of power is ideal for use as a VHF remote. Designed for flush mounting, it fits into a 4-1/4 diameter cutout. Comes equipped with a mini-plug. Features. Completely waterproof and corrosion-proof. Features stainless steel grills, sturdy plastic frames, polypropylene speaker cones and teflon-coated wires. deal for use as a VHF remote. Available in black or white color speaker. Specifications. Peak Power 20W Each. Speaker Impedance 4 ohms. Cutout Diameter 4-3/8 110mm . Overall Diameter 5-15/16 151mm . Mounting Depth 1-5/8 41mm . Per Unit Weight 0.65 lbs This thin, dual cone waterproof communications speaker with 20 watts of power is ideal for use as a Completely waterproof and corrosion-proof. Features stainless steel grills, sturdy plastic frames, p deal for use as a VHF remote. Available in black or white color speaker Specifications. Peak Power 20W Each Speaker Impedance 4 ohms Cutout Diameter 4-3/8 110mm Overall Diameter 5-15/16 151mm