... very especial, and the object shock & move alarm, built in rechargeable Li-battery life is 15 days ... (standby mode), over area alarm, over speed alarm, emergency SOS help, these functions are useful. ... Warning: this tracker only uses the 9-28V DC power supply, too high voltage or AC voltage ... battery (Battery Life 15 days)- Power supply disconnect alarm- It is easy to hidden, used for tracking ...