This is a really nice power supply. It's a switching DC supply so its small and light and efficient. It is thin so it fits in power strips without blocking other outlets. The output is regulated so you'll get a steady 9V up to 1000mA (1 Amp) of current draw. 5.5mm/2.1mm barrel jack, positive tip. This supply is designed to work anywhere in the world, 100V-240V AC wall power, you'll just need a low cost plug adapter. New! This adapter is now CE / UL listed Great for Boarduinos, clock kits and Arduinos, anything that has a 5V regulator! Some customers have asked us why the label seems to say ".1A" instead of "1A" - there is a comma in front of the 1 that looks like a dot! It is really a 1A supply.Technical details Dimensions (wall wart): * 46.8mm x 32.15mm x 32.84mm * 1.84in x 1.26in x 1.29in * Cable length : 146.05cm / 57.5in * Cable Diameter : 3.8mm / 0.15in https://elecena.pl/product/22713508/9-vdc-1000ma-regulated-switching-power-adapter-ul-listed-discontinued 2023-03-06 https://elecena.pl/product/22713508/9-vdc-1000ma-regulated-switching-power-adapter-ul-listed-discontinued 2024-09-19