First, without the call function: relying on the connection of the smart phone to achieve multi-function, can simultaneously operate the phone, text messages, mail, photos, music, etc.;
Second, with a call function: support for inserting a SIM card, essentially a smart phone in the form of a watch; most of the market uses Android systems and IOS systems.
From user needs
Adult smart watch: Function: Bluetooth synchronous mobile phone call, send and receive text messages, monitor sleep, monitor heart rate, sedentary reminder, running step, remote photo, music playback, video, compass and other functions, designed for fashion trends!
Smart Watch for the Elderly: Features: Ultra-precise GPS positioning, family calls, emergency calls, heart rate monitoring, sedentary reminders, medication reminders, and many other features tailored for the elderly, providing an umbrella for the elderly to travel, bring this Watch, refuse us to lose the old man.
Children's Positioning Smart Watch: Features: multiple positioning, two-way calling, SOS help, remote monitoring, intelligent anti-lost, historical track, electronic fence, pedometer, love reward and other functions, to ensure children's safety, give children a healthy and healthy growth surroundings!