These pan & tilt positioners allow you to accurately aim the payload from the ground and continually monitor performance. Range of models includes fixed and variable speed, 115 VAC and 12 VDC operation, low profile model and 15 to 500 pound (7 to 227 kg) capacity models. The design includes: chain & steel worm gear drive train, zero backlash - externally adjustable, ball & tapered roller bearings, internally adjustable limit switches, housing sealed and gasketed to withstand water and dust penetration, baked on textured enamel finish, pan rotation 435° and tilt +/- 90°.