Using this oven timer is super easy. First, find a suitable place to install it on your Simpson or Westinghouse oven or stove. It should fit right in. To set the time, simply turn the dial to the desired number of minutes or hours (up to 2 hours). When the time is up, the timer will make a sound to let you know. As for maintenance, keep it clean by using a dry cloth to wipe off any dust. If it stops working or you notice any issues, don't try to fix it yourself. Contact us, and we'll take care of it as it's fully guaranteed. And remember, if you're not sure if this timer is right for your appliance, send us your model number, and we'll help you out.