PS-1 features:
- Retractable
- Can mount phone in different orientations
- Arca Swiss base

PC-90II features:
- Lightweight compact metallic phone clamp (60g only)
- Rubberized Grip
- Integrated Arca Swiss plate at the base
- 1/4" female threads on bottom surface, and one end of the clamp.
- 56-90mm width can accommodate the largest mobile phones even with cases.
- Quick release button to extend/retract fast