The SmarTrack Trident S7 has been tested to the Thatcham S7 standard. The device operates using GPS/GLONASS, GPRS and GSM technology. Having an internal battery backup, the device can remain operational even when the vehicle’s power supply is removed. The device also monitors the battery voltage level and ignition status. Should any alerts be raised, Global Telemetrics will contact you regarding the safety of your vehicle. Shop now:- https://trackingmycar.co.uk/pr....oduct/smartrack-trid