Includes vibrating and digital receiver which may be worn on your belt or in pocket to alert you when the manual button has been pushed. Will work up to 600 feet distance line-of-sight depending on terrain and antenna height. Built-in vibrating mode for silent paging. Rechargable battery and charger are included. 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".