Antennas and Industrial IoT devices

We provide test & measurement equipment to test in-building communication capability important for first responders and to certify buildings meet certain in-building wireless communication standards. We provide test & measurement equipment to test public safety networks, including P25, Tetra and digital mobile radio ("DMR").

Research and development expenses were higher by $0.1 million for the three months ended June 30, 2022, compared to the same period in 2021.

Sales and marketing expenses include costs associated with the sales and marketing employees, product line management, and trade show expenses.

General and administrative expenses include costs associated with general management, finance, human resources, IT, legal, public company costs, and other operating expenses to the extent not otherwise allocated to business segments.

General and administrative expenses increased by $0.1 million for the three months ended June 30, 2022 compared to the same period in 2021 primarily due to expenses for cash-based incentive compensation programs.

General and administrative expenses increased by $0.3 million for the six months ended June 30, 2022 compared to the same period in 2021 due to expenses for cash-based incentive compensation programs and inclusion of six months of Smarteq's expenses.

Amortization of intangible assets within operating expenses was $67 for the three months ended June 30, 2022 and $138 for the six months ended June 30, 2022, which relates to amortization of intangible assets for Smarteq acquisition.

Our material cash requirements from known contractual and other obligations primarily relate to non-cancelable purchase obligations. Expected timing of those payments are as follows:

Critical Accounting Policies and Estimates

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