The telemetry device we send you is connected when the car is in a deep sleep state when it needs very little energy. In addition, with each trip, when the car is in use, it recharges its small battery, which can run for days, so it doesn't need extra power from the car.
Beat telemetry device power supply:
Power range: 10 - 30 V DC with surge protection
Built-in battery: 3.7 V 45 mAh
Power consumption:
Power consumption: 12 V < 5 mA (Ultra Deep Sleep)
Ultra Ultra Low Sleep 12V-on < 7 mA (Deep Sleep)
12V-on < 7 mA (Online Sleep)
12V-on < 8 mA (GPS Sleep)
12V-on < 28 mA (nominal)