Specification: 1. Press the “ lock ”button, the siren sounds once, then enter the anti-theft state in 5 seconds. If it is triggered by vibration, it will be sound for 5 seconds. If it is triggered in 3 seconds again, sounds for 30 seconds with 6 tones circulated. 2. Press the “unlock” button, the siren sounds twice, the unit disarm. 3.Car search function: Press “mute” or “bell” button, the siren sounds 30 seconds. Press any button to stop. No "mute" or "bell "button no functions. 4.Sensitivity adjustment: It has 7 levels, the 7th is the highest sensitivity, and the 1st is the lowest sensitivity. Default is the 4th. a. Increase sensitivity: Press the “lock”&“unlock” button for 3 seconds at the same time. If the siren sounds 4 times, it means that is the 4th gear. Press “lock” button once, the sensitivity increases one gear, that is the 5th gear, the siren sounds 5 sounds. By analogy, If the siren sounds 7 times, the sensitivity is 7th gear. (Caution the 7th is high and easy to report falsely). After confirming the required gear, do not operate the button for 5 seconds or press “ lock”&“unlock” button for 3 seconds at the same time, and the siren will sound 3 times to exit the sensitivity adjustment mode. b. Reduce sensitivity: Press “lock”&“unlock” for 3 seconds at the same time. If the siren sounds 4 times, it means the current gear is the 4th. When press the “ unlock ” button once, the sensitivity is reduced by one gear, then the siren sounds 3 times, and then press “ unlock” button again, the sensitivity is reduced to 2nd gear. The 1st gear is the lowest gear. After confirming the required gear, do not operate the button for 5 seconds or press “lock ”&“unlock” button for 3 seconds at the same time, and the siren will sound 3 times to exit the sensitivity adjustment mode.