... Description: 1.Battery:: AG13X3 (common button battery) a battery of about six months +24 months 2. ... healthy growth also played a good role.When you are driving, especially long-distance car open, please use ... , whenever you want to doze off when driving a car, it will sound the alarm in the ears ... at night, long-distance driving and drink driving, a voice warning to alert drivers can drive safely, ...