D99+ 1.22 inch HD LCD Screen GPS for the der Smart Watch 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 ectric 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 remoty. 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 dialing, mobile can't dial the short number, because they don't bong to one group. 12. System map: Google, Baidu, AutoNavi, Tencent, OpenStreetMap Parameter: 1. Dimension: 35*60*13mm 2. Machine weight: 43g 3. Key: Tephone Key, Record Key, Power Key, SOS Key 4. Screen: HD LCD screen, 240*240 resolution 5. GSM/GPS: MT2503 6. Number of GPS channs: 20 channs 7. GPS sensitivity: -159DB 8. GPS accuracy: 5-15M 9. LBS accuracy: 100--1000M 10. Language: Chinese and English, restart the watch after setting 11. GPS antenna: High sensitivity active ceramic antenna 12. GSM antenna: Large area FPC gold-plated antenna 13. Battery: G polymer 400mA 14. GSM frequency: /900/1800/1900 15. Standby time: about 45 hours if upload every 30 seconds, about 50 hours if upload every 10 minutes , about 4 days if upload every hour 16. APP support system: Android version 4.0 and above, Apple version 8.0 and above Package Include: - 1 x Wrist watch - 1 x USB cable - 1 x Screwdriver - 1 x Instructions - 1 x Certificate of qualification - 1 x Warranty card