Ultra modern personla tracker, It has GPS and GSM dual positioning functions, SOS Emergency button for help, Incoming call to report positioning info, Remote site continuous tracking, Incoming call music ring to remind users to take this call, 3 programmable speed-dial buttons for emergency dial-out, Remote monitoring, Answering call button and ending call button, Fest button for GPS and GSM signal checking, Using cellular phone, PDA phone, man-serviced control center or internet, web to track and monitor the PT-300, Easy one-button operation, Volume control, Two tri-band GSM modules to choose for worldwide tracking and monitoring, Test button for GPS and GSM signal check, Highly Sensitive GPS module, GPS/GSM signal LED display, Device on, low battery, and charging LED display, Using SIM Card phone book to set reporting numbers and parameters to make the interface easy, Voice output using headset, Long standby time for more than 24 hours.