This system contains PIR sensors to detect intruders(obstacle), GSM Module for communicating with user's Phone and automatic air freshener(filled with Diethyl Ether) for making the intruder faint. The whole system is controlled by Arduino. The system collects all information from PIR sensors, the process that information and sends call and SMS to corresponding GSM mobile phone number by using a GSM modem and gas will be released from the automatic air freshener. If PIR sensors detect any obstacle in a covered area then a signal send to Arduino, which activates GSM, make a call and SMS to the homeowner mobile phone using the GSM Module and from automatic air freshener a gas (Diethyl Ether) will be released to faint the intruder(20 Minutes approx).