Super Vibration: Emergency Call for the Elderly - The vibration mode can be set on the receiver's battery compartment. The combination of ringtones and vibrations grab your attention and don't miss the call button for help. Stop Ringing: If your receiver receives an emergency call at home, you can use the "Stop" feature to stop it if you don't want the ringer to ring for 15 seconds. LONG RANGEAdvanced emergency call, the range of open area is up to 500 feet (walls and other objects will reduce the range), the receiver is not disturbed by other devices, it can work almost anywhere in the house. Ringtone and volume: You can choose the alarm music and volume. There are 5 music tracks to choose from. It can also be used as a doorbell when you choose melody music. 5 adjustable volume levels, min. 0 dB, max. 100 dB. Lightweight and Portable: The waterproof transmitter can be hung on the bed or around the neck. The receiver can be placed upright on a table or in a caregiver's pocket, or attached to a belt or bag.