Do not panic. It is only a test.

There’s a pretty good chance that your cell phone − and everyone else around you in Ohio − will sound at exactly 2:20 p.m. Wednesday, Oct. 4.

That is if all goes well with a planned national test of the Wireless Emergency Alerts system that has been around since 2012.

The alerts have been used some 84,000 times to warn the public about everything from dangerous weather to missing children and other emergencies.

Those who have not opted out of such alerts, have a more recent cell phone and within the radius of a cell tower will receive a vibration alert and a unique tone over their phone as long as they are turned on at the time and are not in airplane mode.

At the same time, a test alert will also go out over TVs that are on at the time.