Includes vibrating and digital receiver which may be worn on your belt or in pocket to alert you when your entry alert system has detected a visitor or when the manual button has been pushed. Will work up to 2000 feet distance depending on terrain and antenna height. Built-in vibrating mode for silent paging. Rechargable battery and charger are included. Transmitter includes inputs for 'NO' or 'NC' 'alarm' inputs. One button 9V battery operated transmitter measures 3-3/4" x 2-1/2" x 1-1/16". Pager receiver measures just 2-1/2" x 1-1/4" x 3/4".