Delete call records; after patient press the alert button; the nurse can delete the designated call records and all cal records according to choice5 adjustable volumes; caregiver call button for nurses station has 5 levels of volumeinclude mutefor adjustment plus 10 languages voice alert; select a peaceful melodic tones chime alert sound of your choice3 call grade; green color is ordinary call; red color is emergency call; the blue color is timeout call; you can choose different color call according to the degree of urgencyIP67 waterproof; offers protection for the caregiver pager; you can completely install it on the wall of a kitchen or bathroom without worrying about water dripping on it and damaging itEasy to expand; the hospital paging system is capable to pair up to 256 call buttons; you can add the call button according to your needs