[Take care of your family] For the elderly, handicapped, or sick, they can page their caregiver, without shouting for help. Caregivers also don't have to be with the patient all the time, setting both parties free..[5 Levels Volume & LED Flash] 5-level of volume range from 0dB to 110dB, accommodate babies and light sleepers. Silent mode with just LED flash is available when you don't want to disturb others..[Waterproof & 52 Melodies] The button is IP55 waterproof and can accept water/soup splashes, but it should be removed before bathing. The caregiver pager system offers 52 tunes to choose from..[Convenient for Carrying]: The transmitter can be worn conveniently around the neck or carried in a pocket. Simply pressing a button on the transmitter will cause the receiver to alert a loud sound, not need to yell to get someone's attention. Replaceable CR2032 battery is included..[High-frequency Technology]: Using adaptive high-frequency technology and more anti-interference, over 500ft/150m in the open area, strong penetration and signal stability, can penetrate a few walls..[Customizable & Expandable] Expand your existing calling system with up to 16 transmitters and unlimited receivers, and each transmitter can be set to different or identical music. As a result, you can use them in multiple rooms in your home or as a medical alarm system.