Wireless Caregiver Pager Beeper By Retail Packing 32 melody sounds(9 emergency sounds+23 soft alarm sounds)can distinguish other doorbell and our product The transmitter with neck cord ,Call button can be worn as a pendant, carried on pocket, or placed at bedside - Call button is water resistant Digital code system to avoid interference, easy installation with 80 metre range LED Flashing light notification good for those with hearing limitations Low voltage alarm, please change battery if transmitter and receivers are flashing all the time