The B0505S-2W is a surface mountable power module SIP (Single In-line Package) manufactured by JETEKPS. It is certified for RoHS (Restriction of Hazardous Substances), which means that it is free from a range of hazardous materials, making it an environmentally friendly choice. It has an input voltage of 4.5-18 VDC and output voltage of 5V/2A, with an efficiency of up to 89%. It also features low standby current of 3.5 mA max, short-circuit, overvoltage, and over-temperature protection. This power module is very small and lightweight, measuring only 24.2 mm x 8.7 mm x 9.4 mm and weighing less than 30g, making it great for a wide variety of electronic projects.