How can I pass two or more parameters by routing annotations?

https://docs.phalcon.io/en/latest/reference/routing.html#parameters-with-names

$router->add(
    "/product/select/{serial:[a-zA-Z0-9_]+}/{id:[0-9]+}",
    array(
        "controller" => "product",
        "action"     => "select"
    )
);

Or getParam

$router->add(
    "/product/([a-zA-Z0-9_]+)/([0-9]+)",
    array(
        "controller" => "product",
        "action"     => "select",
        "serial"       => 1, 
        "id"      => 2
    )
);

Or

$router->add(
    "/product/select/([a-zA-Z0-9_]+)/([0-9]+)",
    array(
        "controller" => "product",
        "action"     => "select",
        "serial"       => 1, 
        "id"      => 2
    )
);

Or 

.... More

When your url looks as follows,

    sipv/product/param = 12

add route,

          $router->add(
    '/sipv/product/:params',
    array(
        'module'     => 'module-name',
        'controller' => 'index',
        'action'     => 'action-name',
        'param'     =>1,
    )
    );

Then in your action

    $this->dispatcher->getParam("param");

Your can go to the following link to read in depth

  https://docs.phalcon.io/en/latest/reference/routing.html

Using annotations, have you tried updating your regular expressions by appending each with a "+" to specify one or more?

You Currently have:

<?php
/**
*@RoutePrefix("/Product")
*/
class ProductController extends BaseController
{
 /**
 * @Get("/select/{serial:[a-z0-9]}/{id:[0-9]}")
 */
public function selectAction($serial,$id){
...
}
}

What happens if you update it like so?

<?php
/**
*@RoutePrefix("/Product")
*/
class ProductController extends BaseController
{
 /**
 * @Get("/select/{serial:[a-z0-9]+}/{id:[0-9]+}")
 */
public function selectAction($serial,$id){
...
}
}

Notice that I updated Get("/select/{serial:[a-z0-9]+}/{id:[0-9]+}") to include the "+" after each regex

why the browser displays the route as well?

sipv/product?serial=aad123&id=12

I put the path manually and can access but I'm sending data via get and appears this route

What web server are you running? Nginx, Apache, etc..?

why the browser displays the route as well?

sipv/product?serial=aad123&id=12

I put the path manually and can access but I'm sending data via get and appears this route

Apache