4G SOS emergency alarm kit DC5V 1A power supply for the host, with 500mAh backup battery Wireless 433 connection: supports up to 20 sensors, 10 SOS buttons Preset 3 phone numbers, equipped with 3 separate call buttons One-touch dialing of all preset contacts Alarm SMS Two-way hands-free calling Automatically answer calls from preset contacts Voice activation No motion alarm - Elderly care (need to use presence sensor) Doorbell function (need to use doorbell button) Low battery warning and emergency pull cord Ultra-light waterproof SOS button with lanyard and built-in 3V or CR2032 buckle battery Application scope: home, hospital, nursing home, retirement home, etc. Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on Voltage: DC5V Color: White Material: plastic Package Contents: 1 x Rescue Call Host 2 x SOS Devices 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.