diff --git a/lisp/ringer.el b/lisp/ringer.el
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+;;; ringer.el --- This is my system interrupt -*- lexical-binding: t -*-
+
+;; Copyright (C) 2020 Benson Chu
+
+;; Author: Benson Chu <bensonchu457@gmail.com>
+;; Created: [2020-01-17 13:53]
+
+;; This file is not part of GNU Emacs
+
+;; This program is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;; Code:
+
+(defvar current-system-clock nil)
+
+(define-minor-mode system-clock-mode
+  nil nil nil nil
+  :global t
+  (cond (system-clock-mode
+         (setq current-system-clock (run-at-time nil 5 (lambda () (interactive) (let ((visible-bell t)) (ding))))))
+        (t
+         (cancel-timer current-system-clock))))
+
+(provide 'ringer)
+;;; ringer.el ends here