"Car alarm is a microcomputer with a GSM module function and a GPS receiver, which is connected to external sensors, external devices, siren. GSM car alarm can function as a GPS/GSM tracker for transportation logistics needing software change. Warning: OKO WEB server receives data only from OKO-E+ GPS car alarms with factory firmware version. Alarm mode is "invisible" (GSM beacons/GPS): low power consumption (with included GPS receiver 2.5 times, GPS receiver turned off 8 times); difficult to scan; difficult to drown."