Features: 1) GPS and GSM dual positioning functions 2) SOS Emergency button for help 3) Incoming call to report positioning info 4) Remote site continuous tracking 5) Incoming call music ring to remind users to take this call 6) 3 programmable speed-dial buttons for emergency dial-out 7) Remote monitoring 8) Answering call button and ending call button 9) Fest button for GPS and GSM signal checking 10) Using cellular phone, PDA phone, man-serviced control center or internet web to track and monitor the PT-300 11) Easy one-button operation 12) Volume control 13) Two tri-band GSM modules to choose for worldwide tracking and monitoring 14) Test button for GPS and GSM signal check 15) Highly Sensitive GPS module 16) GPS/GSM signal LED display 17) Device on, low battery, and charging LED display 18) Using SIM Card phone book to set reporting numbers and parameters to make the interface easy 19) Voice output using headset 20) Long standby time for more than 24 hours