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 Features: 000 # number # number # number # (binding three phone numbers) (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 play then pause after the broadcast --- if the switch key short press pause) 999 ( SMS Coordinate Positioning ) 789 ( Upload voice recorder to 365gps server ) 123#1/0 ( Open/Close auto upload location data ) Voice#1 / Voice#0 ( Sound Detection Auto Voice Recording Upload to Server Listen in 365GPS APP, 1-open, 0-close) S3: ZX303+400mah battery PlayBack: Inquire the moving 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 (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 '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 tothe user size:40x24x12mm Material:plastic colour:Black Package Contents: 1 x GPS Tracker 1 x Battery Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.