How to hide certain widgets on mobile devices

In wordpress theme (the box) exists the function wp_ismobile() in the vars.php file. I am using this function to hide a post slider,

if you not have the wp_ismobile() function you can copy in the functions.php file:

this is the function.
function wp_is_mobile() {
static $is_mobile;

if ( isset($is_mobile) )
return $is_mobile;

if ( empty($_SERVER[‘HTTP_USER_AGENT’]) ) {
$is_mobile = false;
} elseif ( strpos($_SERVER[‘HTTP_USER_AGENT’], ‘Mobile’) !== false // many mobile devices (all iPhone, iPad, etc.)
|| strpos($_SERVER[‘HTTP_USER_AGENT’], ‘Android’) !== false
|| strpos($_SERVER[‘HTTP_USER_AGENT’], ‘Silk/’) !== false
|| strpos($_SERVER[‘HTTP_USER_AGENT’], ‘Kindle’) !== false
|| strpos($_SERVER[‘HTTP_USER_AGENT’], ‘BlackBerry’) !== false
|| strpos($_SERVER[‘HTTP_USER_AGENT’], ‘Opera Mini’) !== false
|| strpos($_SERVER[‘HTTP_USER_AGENT’], ‘Opera Mobi’) !== false ) {
$is_mobile = true;
} else {
$is_mobile = false;
}

return $is_mobile;
}

Regards