Routing from the inputs to the speakers on UR22C with no computer attached

Hi, I currently do not own an audio interface and am looking at buying a UR22C - so this is a question I need an answer to before I buy one. Sorry it is probably obvious, but I can not find a clear answer to this in the user manual.
Question is: If a UR22C is powered up using a USB power supply but is NOT connected to a computer or DAW, can I send an input (mic, Line level synth, guitar etc) through the interface to a pair of attached powered monitors? i.e. so I can simply use it to play a synth into the monitors when not requiring to use any recording software, computer etc.