This is a CE marked UK plug DC power supply. It's switched mode, so the voltage is more tolerant as the current increases.
Perfect 'wall-wart' style PSU for basic projects.
- Voltage : 9V
- Current : 500mA
- Plug : Barrel, centre positive 5.5mm / 2.1mm
- Lead : 1.2m
- Dimension : 62mm X 49mm X 26mm