[Take care of your family]: For the elderly, handicapped, or sick yo page their caregiver. Also good for massage therapists, the perfect answer to knowing for sure when the client is ready without waiting too long to enter the room or not giving them enough time before knocking..[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..[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 be disturbed..[Waterproof & 52 Melodies]: Buttons is IP55 waterproof, acceptable for Meal/Soup Splash, and allow to be installed in the washing room. The Life Alert Systems offers 52 tunes for your choice..[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.