The OKY3440 is an automated reed switch sensor manufactured by OKYSTAR. It operates within a power supply range from 3.3V to 5VDC, giving it a wide range of compatibility. The sensor measures the presence of certain objects or magnetic fields, making it useful in sensing and automation applications. It is also relatively small and easy to install, with a typical size of 10mm x 5mm x 3mm, allowing it to be used in tight spaces or confined areas. With its environmental accreditation, the OKY3440 is resistant to fluctuations in temperature, humidity, shock, and vibration, making it reliable even in industrial settings.