How does 'map' work in admin side?

Hi,

I try to place a location picker via google map into a post type, but doesn’t work out, it just shows name and desc but no any buttons. My code is:

$meta_boxes[] = array(
		'id'       => 'product_information',
		'title'    => 'Product Information',
		'pages'    => array( 'ptd_product'),
		'context'  => 'normal',
		'priority' => 'high',

		'fields' => array(
			array(
				'name'  => 'Number of days',
				'desc'  => 'How many days this travel product includes?',
				'id'    =>  'numberOfDays',
				'type'  => 'number',
				'std'   => '2',
			),
			array(
				'name'             => 'Location',
				'desc'             => 'Where it is exactly located, pick it up in map',
				'id'               => "location",
				'type'             => 'map',
			),
		)
	);

https://wordpress.org/plugins/meta-box/