Exhibit 99.1

FOR IMMEDIATE RELEASE

COMMUNICATIONS SYSTEMS, INC. REPORTS FIRST QUARTER 2018 FINANCIAL RESULTS

Minnetonka, MN – May 14, 2018 – Communications Systems, Inc. (NASDAQ: JCS) (“CSI” or the “Company”), a global provider of connectivity infrastructure and services for deployments of broadband networks, today announced financial results for the first quarter (“Q1”) ended March 31, 2018, including a discussion of results of operations by segment.

First Quarter 2018 Summary

CSI’s Chief Executive Officer Roger H.D. Lacey commented, “While our consolidated Q1 results don’t reflect the financial progress we originally expected, we are seeing improvements in many segments of the business and have clear plans for the rest. First, the positives. Transition Networks’ business outlook remains positive after seven consecutive profitable quarters. Its new product sales¹ were $2.6 million for the quarter and 28% of total sales. Supply chain issues from last year have been addressed and our focus is now on revenue growth with Power-over-Ethernet offerings.

“JDL’s Q1 loss can be explained by approval delays within its primary education customer’s federal funding process and late last week we were informed funding was approved for the customer and therefore we expect a positive recovery in future quarters this year. Net2Edge has experienced some additional revenue delays as customers extended their proof-of-concept stage for Net2Edge’s new products. However, new product orders for Net2Edge were a highlight for the quarter and now stand at close to $1.0 million.

“The impact of the Tier 1 Telecom companies’ continuing pricing pressure and new program delays, industry wide, continues to severely impact Suttle’s operations. Extensive right sizing of operations have taken place and improving margins reflect progress within Suttle. Underutilized capacity in manufacturing operations remains a significant cost issue for Suttle, however. Further, the business is rapidly repositioning its operations to take advantage of the emerging market of home automation and residential Internet of Things (“IOT”), where simplifying the installation process and cyber security remain issues. Our new “Securely Wired” offer, expected to launch third quarter 2018, is expected to take advantage of this emerging growth opportunity.”

Mr. Lacey concluded, “The business transformation process that started in late 2016 continues as we respond to market forces. We certainly are behind where we thought we would be at this time but remain optimistic. In addition, we believe a strong balance sheet with our cash and investments position provides us the stability we need as we seek to return to sales and operating profit growth.”

¹ “New product sales” represent sales from new products introduced within the last three years.

Q1 2018 Segment Financial Overview

Transition Networks

Transition Networks’ Q1 2018 sales increased $149,000, or 2%, compared to Q1 2017, primarily due to an increase in federal projects. Sales in North America increased $570,000, or 8%, while international sales decreased $421,000, or 22%. Operating expenses in Q1 2018 decreased $24,000 compared to the prior year. Transition Networks’ operating income was $212,000 in Q1 2018, compared to $146,000 in Q1 2017, as margins and operating costs remained consistent.

Suttle

Suttle’s sales decreased 21% to $7.0 million in Q1 2018 from $8.8 million in Q1 2017 due to lower sales of its legacy products. Sales to the major communication service providers decreased 26% to $5.9 million in Q1 2018 from $8.0 million in Q1 2017. Gross margin as a percentage of sales increased to 19.7% from 12.1% in the same period of 2017 primarily due to establishing a new pricing strategy for distributors and discontinuing the sale of several lower margin legacy products. Operating expenses in Q1 2018 decreased $342,000 compared to prior year when Suttle expensed $388,000 in Q1 2017 for restructuring expense related to the closing of its Costa Rica production facility. Operating loss narrowed year over year due to improved margins and the absence of restructuring costs in 2018.

JDL Technologies

JDL Technologies’ sales decreased 75% to $710,000 in Q1 2018 from $2.9 million in Q1 2017. Revenue from the education sector declined more than we expected with Q1 2018 revenue at $109,000 compared to $2.1 million in Q1 2017. The revenue decline is due to the winding down of the current technology refresh cycle at JDL’s largest customer coupled with funding delays in other planned projects. Operating expenses decreased 16% in 2018 to $486,000, compared to $576,000 in 2017 due to expense reduction measures taken in light of the expected revenue delay in the education sector. Q1 2018 ended with an operating loss of $504,000 compared to operating income of $385,000 Q1 2017.

Net2Edge

Net2Edge’s sales decreased 54% to $165,000 in Q1 2018 from $357,000 in Q1 2017 due to delays in the release of new products and longer customer evaluations of its new products. Operating expenses increased 28% in 2018 to $904,000 compared to $708,000 in 2017 due to increased spending on engineering and research and development on new products.

Financial Condition

CSI’s balance sheet at March 31, 2018 included cash, cash equivalents and investments of $17.6 million and working capital of $35.2 million, compared to $18.0 million cash, cash equivalents and investments and $36.5 million working capital at December 31, 2017.

Form 10-Q

For further information, please see the Company’s Form 10-Q, which the Company expects to file on or before May 15, 2018.

About Communications Systems

Communications Systems, Inc. provides connectivity infrastructure and services for global deployments of broadband networks. Focusing on innovative, cost-effective solutions, CSI provides customers the ability to deliver, manage, and optimize their broadband network services and architecture. From the integration of fiber optics in any application and environment to efficient home voice and data deployments to optimization of data and application access, CSI provides tools for maximum utilization of the network from the edge to the user. With partners and customers in over 50 countries, CSI has built a reputation as a reliable global innovator focusing on quality and customer service.

Forward-Looking Statements

This press release includes forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, including statements regarding future financial performance, and future growth. These statements are based on Communications Systems’ current expectations or beliefs and are subject to uncertainty and changes in circumstances. Actual results may vary materially from those expressed or implied by these statements due to changes in economic, business, competitive or regulatory factors, and other risks and uncertainties affecting the operation of Communications Systems’ business. These risks, uncertainties and contingencies are presented in the Company’s Annual Report on Form 10-K and, from time to time, in the Company’s other filings with the Securities and Exchange Commission. The information set forth in this press release should be read in light of these risks. Further, investors should keep in mind that the Company’s financial results in any particular period may not be indicative of future results. Communications Systems is under no obligation to, and expressly disclaims any obligation to, update or alter its forward-looking statements, whether as a result of new information, future events, changes in assumptions or otherwise.

Contacts:

Communications Systems, Inc.

Mark D. Fandrich

Chief Financial Officer

952-582-6416

mark.fandrich@commsysinc.com

Roger H. D. Lacey

Chief Executive Officer

952-996-1674