Hd display: high sensitive capacitive touch screen;perfect match technology 2.the lost function: seek mobile phone,tow-way anti lost;entertainment: mp3,mp4,camera;sync function: twitter,facebook;time,schedule,read message or ;sport health: pedometer,sedentary remind,sleep monitoring 3.phone function: make phone call directly from the smart watch,including answering and dial-up.sim slot,support make calls by bluetooth or smart watch 4. Gsm850/900/1800/1900 four frequency call function call, , phone records, phone book, bluetooth phone 5.:android system:this watch supports android phone's bluetooth, app download and connection, you can also push your android phone app related application information to the watch. Does not support ios. 7.this watch has two working mode: one is company mode (Bluetooth), it enable to make call or receive call or send or get message via bluetooth the other one is network mode (Sim Card inserted) .it enable to make call or receive call and send or get message via the sim card you inserted which means at this time this watch works as a real cellphone,you can hang out without your cellphone