This is a 0201 (0603 Metric) chip resistor, manufactured by Yageo; it has a resistance of 49.9 Ohms, a tolerance of ±1%, a power rating of 0.05 Watts (1/20 Watts), and is moisture resistant. It is part of Yageo's Thick Film product line, and carries a part number of RC0201FR-0749R9L.