All lot of features at a low cost.
Mono, stereo, parallell och bridged, Ground lift, variable sensitivity and possibility to automatic standby, relay on the output when starting up and the possibility to use a lot of different connectors are good features for a low cost.
The fan is somewhat noisy, but when mounted in a 19" rack its no problem for my use. The noise level is very low and sound quality is ok, regarding the price.