Function:
1. GPS+LBS+WiFi positioning.
2. Familiarity number dialing two-way conversation and voice monitoring.
3. Support One-key first-aid.
4. Wrist off alarm: When falls off the wrist, it gives the alarm to APP client.
5. Support Safety fence.
6. Historical trace: 90 days historical traces
7. Low battery alarm: When electric quantity is lower than 10%, it will give alarm to APP client.
8. WeChat: Through GPRS data transfer, it probably has 10 seconds' voice conversation transfer
9. Remote power-off: APP client can power off the watch remotely.
10. Do not disturb mode: Set up master control number and familiarity number, can reject cold calls, be sure to set up master control number first.
11. Address book: Support short number diali
