1TRANSMITTER AND RECEIVER: The transmitter and receiver can be paired arbitrarily, there are 38 songs to choose from, 4 gear volume adjustment. 2LONG WIRELESS DISTANCE: Wireless caregiver pager is using 433MHZ wireless frequency, the receiver can receive signals as far as 330m in open space. 3EASY TO USE: Elderly monitoring call button is plug and play, easy to use by plugging the receiver into an electrical outlet, very convenient to use. 4WIDE USE: Caregiver pager is suitable for patients, the elderly, pregnant women, children to call for help, 50m/160ft through wall, regardless of horizontal or vertical distance. 5COMPACT DESIGN: call button is easy to carry and can be carried in pocket or hung around the neck with a sling, or can be installed by the bed.