diff --git a/README.md b/README.md
index 212dc66..5ee5d19 100644
--- a/README.md
+++ b/README.md
@@ -70,13 +70,11 @@ echo $link->webOffice();
 // Generate a data URI for an ics file (for iCal & Outlook)
 echo $link->ics();
 echo $link->ics(['URL' => 'https://my-page.com', 'UID' => 'custom-id']); // 
-echo $link->ics([], ['format' => 'file']); // e.g. to attach ics as a file to an email.
-
-// Generate a data uri for an ics file with default reminder (for iCal & Outlook)
+// Generate a data uri for an ics file with the default reminder (for iCal & Outlook)
 echo $link->ics(['REMINDER' => []]);
-
 // Generate a data uri for an ics file with a custom reminder (for iCal & Outlook)
-echo $link->ics(['REMINDER' => ['DESCRIPTION' => 'Remind me', 'TIME' => DateTime::createFromFormat('Y-m-d H:i', '2018-02-01 08:15', new DateTimeZone('UTC'))]]);
+echo $link->ics(['REMINDER' => ['DESCRIPTION' => 'Remind me', 'TIME' => 1706264894]]);
+echo $link->ics([], ['format' => 'file']); // e.g. to attach ics as a file to an email.
 
 // Generate a data URI using arbitrary generator:
 echo $link->formatWith(new \Your\Generator());
diff --git a/src/Generators/Ics.php b/src/Generators/Ics.php
index 0103d32..248b674 100644
--- a/src/Generators/Ics.php
+++ b/src/Generators/Ics.php
@@ -7,6 +7,7 @@
 
 /**
  * @see https://icalendar.org/RFC-Specifications/iCalendar-RFC-5545/
+ * @psalm-type IcsOptions = array{UID?: string, URL?: string, REMINDER?: array{DESCRIPTION?: string, TIME?: \DateTimeInterface}}
  */
 class Ics implements Generator
 {
@@ -15,17 +16,18 @@ class Ics implements Generator
 
     /** @var string {@see https://www.php.net/manual/en/function.date.php} */
     protected $dateFormat = 'Ymd';
+
     /** @var string */
     protected $dateTimeFormat = 'Ymd\THis\Z';
 
-    /** @var array<non-empty-string, non-empty-string> */
+    /** @var IcsOptions */
     protected $options = [];
 
     /** @var array{format?: self::FORMAT_*} */
     protected $presentationOptions = [];
 
     /**
-     * @param array<non-empty-string, non-empty-string> $options Optional ICS properties and components
+     * @param IcsOptions $options Optional ICS properties and components
      * @param array{format?: self::FORMAT_*} $presentationOptions
      */
     public function __construct(array $options = [], array $presentationOptions = [])
@@ -69,22 +71,8 @@ public function generate(Link $link): string
             $url[] = 'URL;VALUE=URI:'.$this->options['URL'];
         }
 
-        if (isset($this->options['REMINDER'])) {
-            $description = 'Reminder: '.$this->escapeString($link->title);
-            if (isset($this->options['REMINDER']['DESCRIPTION'])) {
-                $description = $this->escapeString($this->options['REMINDER']['DESCRIPTION']);
-            }
-
-            $trigger = '-PT15M';
-            if (isset($this->options[ 'REMINDER'][ 'TIME'])) {
-                $trigger = 'VALUE=DATE-TIME:'.gmdate($dateTimeFormat, $this->options[ 'REMINDER'][ 'TIME']->getTimestamp());
-            }
-
-            $url[] = 'BEGIN:VALARM';
-            $url[] = 'ACTION:DISPLAY';
-            $url[] = 'DESCRIPTION:'.$description;
-            $url[] = 'TRIGGER:'.$trigger;
-            $url[] = 'END:VALARM';
+        if (is_array($this->options['REMINDER'] ?? null)) {
+            $url = [...$url, ...$this->generateAlertComponent($link)];
         }
 
         $url[] = 'END:VEVENT';
@@ -125,4 +113,30 @@ protected function generateEventUid(Link $link): string
             $link->address
         ));
     }
+
+    /**
+     * @param \Spatie\CalendarLinks\Link $link
+     * @return list<string>
+     */
+    private function generateAlertComponent(Link $link): array
+    {
+        $description = $this->options['REMINDER']['DESCRIPTION'] ?? null;
+        if (! is_string($description)) {
+            $description = 'Reminder: '.$this->escapeString($link->title);
+        }
+
+        $trigger = '-PT15M';
+        if (($reminderTime = $this->options['REMINDER']['TIME'] ?? null) instanceof \DateTimeInterface) {
+            $trigger = 'VALUE=DATE-TIME:'.gmdate($this->dateTimeFormat, $reminderTime->getTimestamp());
+        }
+
+        $alarmComponent = [];
+        $alarmComponent[] = 'BEGIN:VALARM';
+        $alarmComponent[] = 'ACTION:DISPLAY';
+        $alarmComponent[] = 'DESCRIPTION:'.$description;
+        $alarmComponent[] = 'TRIGGER:'.$trigger;
+        $alarmComponent[] = 'END:VALARM';
+
+        return $alarmComponent;
+    }
 }
diff --git a/src/Link.php b/src/Link.php
index e584e0c..9230480 100644
--- a/src/Link.php
+++ b/src/Link.php
@@ -16,6 +16,7 @@
  * @property-read string $description
  * @property-read string $address
  * @property-read bool $allDay
+ * @psalm-import-type IcsOptions from \Spatie\CalendarLinks\Generators\Ics
  */
 class Link
 {
@@ -128,6 +129,7 @@ public function google(): string
     }
 
     /**
+     * @psalm-param IcsOptions $options ICS specific properties and components
      * @param array<non-empty-string, non-empty-string> $options ICS specific properties and components
      * @param array{format?: \Spatie\CalendarLinks\Generators\Ics::FORMAT_*} $presentationOptions
      * @return string