Cell Phone Function:TDTV1 is a complete cell phone,configured with Speaker,MIC,buttons for-Calling and Hang-up * Geo-Fencing Control:Set a limited area, alarms while crossing over the area * Locating Position:Receiving feedback while device is in movement. * Locating via Internet:Tracing Position, Monitoring, Playback Tracks and other operations via Internet * Live Voice Monitoring:Inspecting environment of device location with cell phone.Listen to teen or area around tracker covertly