What high-lift devices are used on the Bombardier Dash 8 Q400?
The Dash8 - Q400 - Aeroplane General PDF (courtesy of smartcockpit.com) indicates on page 27 that there are inboard and outboard flaps.

Reading through the Dash8 - Q400 Flight Controls PDF (also from smartcockpit.com) indicates that:


  Two single-slotted inboard and outboard fowler flaps are attached to the trailling edge of each wing (Figure 12.8-1).page 43


There is no indication of slats or any other high-lift device.