Low-power 2.21-GHz products refer to a category of electronic components designed for energy-efficient operations in the 2.21 GHz frequency range. These products are typically used in industries such as telecommunications, IoT, and industrial automation. They are not tied to a specific brand but are offered by various manufacturers globally, including companies like Texas Instruments (USA), STMicroelectronics (Switzerland), and NXP Semiconductors (Netherlands). These products include RF transceivers, low-noise amplifiers, and other wireless communication modules, catering to applications requiring minimal power consumption and reliable performance.