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Step 1. Prepare for Installation (Cont)2. Check that you have everything required for the installation:
• Three AAA alkaline batteries
• No. 2 Phillips screwdriver and standard pocket screwdriver
• Drill
• Drill bit — use 3/16 in. for drywall; use 7/32 in. for plaster
• Level (optional)
• Hammer
• Pencil
• Electrical tape