The trim pot on the front panel adjusts the voltage to what you want.
I use one of these to power my 100w VHF amplifier at 26v.
It has some permanent pen marks and some scratches to the case.
It is quite compact::- 210mm long x 100mm wide x 50mm high and weighs 0.7kg.
Simple wire attachment, that clamps the wire in place and holds it tight with a built in captive screw. The clear plastic blanking plate just clips on an off to allow access to the captive screw panel.
Postage £2.99 by royal mail second class