SYNLETT Stand Alone LCD Pager is capable of programming with 30 wireless call buttons. The LCD screen displays the first called numbers from the calling bell. 4 adjustable volumes, 7 chimes, and 1 alarm siren. Operating range up to 500ft/150m. Flexible alert modes: chime or silent with vibration low battery indicator. This product comes with 4 call buttons and 1 LCD pager, batteries included, and can be used right out of the box.