One click call for timely help wireless elderly pager. When you need help, just press the transmitter button and your family will know they need to come and help offers a wide selection of 38 melodies and 4 volume levels to meet your needs for different occasions. Flashing light with audio alert indicators which is easy for people including the hearing impaired to notice. Hanging rope design for wearing with a hanging rope, which can be carried around or hung around the neck. In case of emergency, send signals in a timely manner The ringtone does not change when restarting. After an unexpected power outage, the settings remain the same after restarting.No need to repeat operations. The signal is stable, the call is unobstructed, and the penetrating performance is strong. The receiving distance can reach 350 meters in a straight line from the open air.ps: The actual received signal depends on the environment, and the signals are different due to different obstacles. Ringtone: 38 songs Plug Type: US Plug, it applies to Canada, India, Mexico, Thailand, Taiwan, the United States, the Philippines and so on. Plug Type :EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on. Voltage: AC 220V Voltage: AC110V Colour:White Material:ABS Package Contents: 2 x transmitter 1 x receiver 1 x Chinese and English instruction manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.