The built in automation module has been designed to record and recognize your dogs own barking so that there is less risk of an accidental Best dog shock collar triggered by another dog's bark. The battery is run on a 6-volt lithium charge, but shock uses static type electricity that feels similar to the small static spark from a carpet, which basically gives a surprised feeling, but doesn't hurt. To protect your dog from over shocking the module is set on a 15 shocks in 30 seconds limit, after which it will refrain from giving shocks for 3 minutes.