The Bourns 3309P-1-502 is a 9mm round trimpot potentiometer, now obsolete and not recommended for new designs. It offers a top and single-side adjustment, a cross-slot adjustment design, and is RoHS compliant. Suitable for trimmer applications, this potentiometer features a wide resistance range (100 ohms to 2 megohms), essentially infinite resolution, and a temperature coefficient of ±250 ppm/°C. It's designed for horizontal and vertical mounting and includes dust/splash resistant covers. Users should verify actual device performance in their specific applications.