Features: 1.Adjustable: The pager has 38 music tracks to choose from and 4 levels of volume adjustment, which can be adjusted according to your preference. 2.Easy to Use: The transmitter and receiver of the pager can be paired at will, making it easy to use and highly penetrating. 3.Wide Application: The pager can be applied to scenarios such as elderly pager, wireless doorbell, greeter, and hospital patient call. 4.Remote Transmission: The pager can achieve ultra long distance signal transmission, 330 meters in open area and 50 meters through the wall. 5.ABS Housing: The pager is made of ABS, and the buttons are small and lightweight, so it's easy to just press them. specification:Item Type: Elderly Monitoring Call Button Material: ABS Wireless Reception Distance: Approx. 330m / 1.82.7ft (open area) Wireless Frequency: 433MHZ Mode: 1 to 2 Remote Control Built in Battery: 2 x 23A/60mAh alkaline battery Voltage: 100-240V PackageList:1 x Elderly Monitoring CallReceiver 2 x Remote Control 1 x Instruction