The Mountain Saw-wing occurs in the mountains of Cameroon and on Bioko Island in Equatorial Guinea. It is about 12 cm long, weighs 11–12 g and catches insects while flying above mountain forest.
Its upperparts are a dull chocolate brown; the wings are slightly darker than the body, and the brown tail is slightly forked. It is about 12 cm long and weighs 11–12 g.
It catches flying insects by day over mountain forest. A Bioko study recorded it around Moka in a landscape that included secondary forest.
An extinction-risk assessment has not been added yet.