Gas Smoke Leakage Detector Alarm System

GAS/SMOKE DETECTION & ALARM DIY PROJECT ASSEMBLED KIT
Brief 
The project is a FULLY ASSEMBLED KIT 
The project includes a small gas sensor board which is interfaced to other board with LM358 on it. The gas sensor senses the smoke and sends the signal to LM358 which will compare the signal voltage with a reference one. Based on a proper smoke signal, the IC will switch on the transistor which in turn will switch on the Alarm via relay. The alarm stops once the smoke fades away. 
Project Features
Fully Assembled project kit
Slide switch on/off control on board
LM 358 based circuit
Gas/Smoke Sensor 
DC Buzzer interface
9V Battery Included 
Includes Storage Box & Project Document

PCB DOES NOT CONTAIN ANY LOGO OR TRADEMARK, Hence can easily be used for school/college project purposes