The top symbol indicates a switched mode powersupply.
PS05 appears to be a Kärcher designation for a power supply producing 22VDC at 0.75A with that DC connector. Searching Kärcher PS05 found me images of USA and Europlug variants.
The bottom symbol looks like a drawing of the DC end showing polarity.
16.5W but 0.5A, at 0.5A there's no regulation of power factor, it really could be that bad, or the 0.5A claim could be strategic, giving the manufacturer the option of substituting a supply circuit with a worse power factor (up-to 0.5A) in the future.