After the initial training period at home, dogs quickly learn to respond to the warning tone prior to any static correction in new locations and with 15 levels of stimulation to choose from, you can select the level that is right for your dog ?a gentle reminder or higher levels for difficult dogs or dangerous situations.?Completely portable with travel bag and rechargeable fence unit operates for up to 36 hours. Features: Fence unit battery life: up to 48 hours depending on usage. Operation range: training 100M and fencing 30M. Collar strap: grey nylon 3/4" wide. System Includes: 10" boundary flags 50 pack, Black travel bag: 10.75" x 5.5" x 5.5", Adaptor, S contact points and M/L contact points.