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 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 . 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. 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. Specification: Main unit: Working voltage: DC 12 3V Static current: 10 mA Siren: 10A Working frequency: 433.92MHZ Remote control: Working voltage: DC 12V Average static current: 0 mA Material:ABS colour:Black + Silver Package Contents: 1 x Main Control Unit 2 x Remote Control Only the above package content, other products are not included. Note: Light 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.