Stable and Extended Distance Signal – This pager offers stable anti-interference transmission up to 1000 Feet in open areas (Obstacles might reduce operating range). Resistant Key Design – Cordless calling keys come with a durable ABS shell, pre-paired with display, plug-and-play. Versatile Ringtones – Receiver provides a variety of ringtones (Dingdong, alert, notification music in terminal) and fifteen adjustable sound levels from 0db to 114db. Fully Functional and Useful – This cordless pager handles up to 999 wireless alert keys. Easy to configure, remove keys, adjust sound levels, and clear entries. A great helper for your enterprise. Wide Array of Applications – This nurse call system acts as a central monitoring system suitable for nurse stations, hospitals, wellness centers, elderly facilities.