Vertex Standard eVerge portable digital radios meet IP57 standards for ingress protection from dust and water. To ensure the radio is watertight, the accessory port is sealed with a cover, which can be removed when using an audio accessory. However, unless the audio accessory connector is specifically designed to for use with an EVX-531, EVX-534 or EVX-539 radio to seal out the water, the radio will not be waterproof when using an accessory.
This video produced by Vertex Standard shows how to properly remove the accessory connector port cover and connect an approved accessory on a Vertex eVerge EVX-539 Digital Portable Two Way Radio.
Buy Two Way Radios is an authorized Vertex Standard dealer.