What safety precautions should I follow when using the trimmer?

Always wear safety glasses with side shields marked to comply with ANSI Z87.1, and keep all bystanders, children, and pets at least 50 feet away. Remove or disconnect the battery before servicing, cleaning, or removing material from the trimmer. Never operate the trimmer when tired, ill, or under the influence of alcohol, drugs, or medication, and only use 40V Kobalt batteries. (Pages 7–8)