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SuperSquare-Laser 1 ON / OFF switch 2 Spirit levels for wall applications 3 Laser output windows 4 90° try-square edge 5 Levelling foot 6 Levelling foot adjustment 7 Battery compartment 8 Levelling foot, removable for tripod applications (1/4" threads) Inserting batteries Open the battery compartment (7) and insert batteries according to the symbols.