In the digital inputs of AK7(S) GPS vehicle tracker, you can connect some external components: (doors sensor, on/off button, panic button for emergency messages, etc...) and on the digital outputs connect: (relay, buzzer). ATrack AK7(S) accept 3 tracking modes: (sending commands with mobile phone text messages, using server offer by ATrack, from an external tracking management platform), the data packets with scheduled reports can send with the (TCP/IP - UDP/IP - SMS) protocols. With AK7(S) and his "1-Wire" interface, can manage the hours of service of: (the temperature of your vehicle connecting an temperature sensor, the trailer ID, use iButtons for driver identification). Thanks to "RS232 4 pin connector" port, you can connect the follow external hardware with ATrack AK7(S) GPS vehicle tracker: (ATrack CAN solution, OBDII cigar power cable, Garmin PND (FMI 2.0), CMOS Camera, RFID reader & Tag) improving the technical functions of tracker. ATrack has designed AK7(S) tracker with an 3-axis accelerometer that is capable of detect any movement or impact in your vehicle, thanks to 3-axis accelerometer you improving the performance of your vehicle and increase the driving control.