The Deluxe UltraLight receiver collar features 4 adjustable levels of static correction plus tone-only mode for training to help you find the right level for your pet. Additional built-in safety features help keep your pet safe in your yard. For dogs 3.6 kg or more. Receiver with adjustable collar for neck sizes 15.24cm - 71cm. Waterproof Receiver Collar with 4 adjustable levels of static correction. Tone-only mode alerts your pet with a beep. Expandable up to 10 acres with additional wire (not included). Covers up to one third of an acre with included boundary wire.