Easy handling: one-button operation and self-explanatory display. Self-levelling of 8% ( 5) in the horizontal mode. (Levelling time 15s) Automatic shock warning function prevents levelling errors in the event of vibrations or shocks. Rotation Speed: 600 rpm. Operating Time Max: Rechargeable Batteries (NiMH) 30hr. Tripod Thread: 5/8" x 11