The 0-55 MHz DDS signal generator is a compact and nice unit, however, the product as is, will not function correctly without added switches and encoder components. Not too bad a problem, just take note, it does not output HF signals out of the box as pictured and all the other 0-55 MHz DDS units available from vendors. I am giving it a good rating, it just needs to be be setup and maybe a pictured illustration.