This is a Tusa RS-681 regulator (with first and second stages).
This Tusa regulator is easy to breathe with. The regulator is easy to move. New ones are expensive.
It has been serviced for 100 dives. It has not been used for three years, so we recommend annual maintenance.
I haven't been diving recently so I'm selling this regulator. It's a used item but in good condition.
Since it is a used item, it needs to be serviced once a year. There are some scratches, but it worked fine the last time I used it.