Catchmaster 48WRG Cold Temperature Glue Board Traps are non-toxic and 100% effective in temperatures as low as 0 degrees F. When using in cold winter conditions, there is no worry of the glue freezing or becoming hard. A Perfect for unheated basements, garages and warehouses, walk-in refrigerators and winterized summer homes. Pre-baited and ready to use. Tips for Effective use: 1. Separate traps from each other. For trapping rats, place boards 10-15 feet apart. For mice, place boards 8-10 feet apart. 2. Place lengthwise, directly against walls and in areas where rodents are observed. 3. If no rodents are trapped in 5-7 days, move the glue trap to a new location.