The T1 Pre-baited mouse bait station is the newest innovative rodent control product from Bell Laboratories. The T1 station is pre-baited with a 1 oz. block of bromethlin, a fast acting rodent bait that can kill up to 20 mice and has a lower risk of secondary poisoning. Each station has a clear lid so you can easily see if the bait is gone or how much has been eaten. Once the bait is consumed the station can be discarded. The T1 stations are classified as a tier 1 level station by the EPA, which is tamper resistant to children and pets and weather resistant. The station can be used indoors as well as outdoors. Each box contains 4 individual use disposable stations.