ES-28 Simple Car Security Alarm (DC 12V Negative ground only)
HOW TO USE
TO ARM the alarm :
Step (1) Open any door
Step (2) Set alarm by turning On the switch with the door remains open
Step (3) Close the door & the alarm is armed
TO DIS-ARM the alarm :
1) Turn OFF the switch within 15 sec. after entering the car. Failing to do so, the horn will be sounded for around 50 sec. to scare off the burglar
NOTE : if the alarm is triggered by terminal  (car radio), the horn will be sounded instantly (without any delay) whereas triggering by door switch will activate the 15 sec. ENTRY DELAY.
LED1 (green) : 15 sec. ENTRY DELAY indicator. This LED lights up whenever any door is opened during "ARMED" mode.
LED2 (red) : 50 sec. HORN TIMER indicator. This timer control the sounding time of car horn.
TIPS : If desired, the ENTRY DELAY & HORN TIMER can be changed by altering the values of R6 & R9 respectively.