The SL151 provides exceptionally smooth and quiet movement, and is a great automated projector lift for finished ceilings in homes and corporate offices. Easy installation, fits into 2 x 2' suspended ceiling. Independent roll, pitch and yaw. Precise positioning including vertical projector cradle adjustment and fore/aft projector positioning. Quick connect/disconnect for convenient lamp and filter access on most projectors. Maintains registration even when disconnected. Low profile, requires minimal clearance above the ceiling.