@GB Features: OOTDTY 000 # number # number # number # (binding three phone numbers) 111 (SMS recording 10 minutes pause) 222 (voice recording 5 minutes pause) 333 (voice-activated dial-back telephone) 444 (delete all contents of memory) 555 (turn off all features) 666 (vibration alarm SMS) 777 (vibration alarm telephone) 888 (play the memory recording --- such as the next play then pause after the broadcast --- if the switch key short press pause) 999 ( SMS Coordinate Positioning ) 789 ( Upload 10seconds voice recorder to 365gps ftp server ) 123#1/0 ( Open/Close auto upload location data ) Voice#1 / Voice#0 ( Sound Detection Auto Voice Recording Upload to FTP Server Listen in 365GPS APP, 1-open, 0-close) S3 : ZX303+400mah battery S7: ZX303+1000mah battery Specification: Multiple Positioning Mode: GPS+ AGPS+LBS+WIFI + TF Card and APP Voice Recorder Worldwide GSM+GPRS 4-frequency System: 850/900/1800/1900MHz Automatic Time Update: Precise GPS time service and no manual time adjustment is needed Track: The user's specific location can be inquired through the cell phone APP or the computer Fence: Designate an area on the map by setting the device as the center point and the alarm will be triggered off immediately once the user of the device goes into or out of this area PlayBack: Inquire the moving routes of the device in the past 3 months anytime and anywhere SOS: In case of emergency, press the SOS button and the device will send out the call and message for help to the guardian (long press power button 4 seconds) Walk: Counts the steps the user has walked Reward: The reward is sent out through the APP on the guardian's cell phone and the reward progress can be viewed Voice: With the highly sensitive microphone, the sound around the device can be heard in real time in case the emergency happens to the user Remote Power-off: The device can be turned off through the APP on the guardian's cell phone Remote Restart: The device can be restarted through the APP on the guardian's cell phone Intelligent Power Saving: The device turns off/on the GPS and data upload in the time range specified through the APP on the guardian's cell phone. Map: Baidu map and Google map. Quantity:1 Set Note:1.Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes:(No Retail Packages) 1 x GPS Tracker 1 x Battery