1. the " lock "button, the siren sounds once, then enter the anti-theft state in 5 seconds. If it is triggered by vibration, it be sound for 5 seconds. If it is triggered in 3 seconds again, sounds for with 6 tones circulated. 2. the "unlock" button, the siren sounds twice, the unit disarm. 3. Car search function: "mute" or "bell" button, the siren sounds . 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: the "lock"&"unlock" button for 3 seconds at the same time. If the siren sounds 4 times, it means that is the 4th gear. "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. After confirming the required gear, do not operate the button for 5 seconds or " lock"&"unlock" button for 3 seconds at the same time, and the siren sound 3 times to exit the sensitivity adjustment mode. b. Reduce sensitivity: "lock"&"unlock" for 3 seconds at the same time. If the siren sounds 4 times, it means the current gear is the 4th. When the " unlock " button once, the sensitivity is reduced by one gear, then the siren sounds 3 times, and then " 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 "lock "&"unlock" button for 3 seconds at the same time, and the siren sound 3 times to exit the sensitivity adjustment mode. Color: As Shown Material: plastic Package Contents: 1 * Main Control Unit 2 * Remote Control Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.