![enter image description here][1] ![enter image description here][2] ![enter image description here][3] **DESCRIPTION** The sensor is designed for indoor air quality testing. The main gas detected is carbon monoxide, alcohol, acetone, thinner, formaldehyde and other slightly toxic gases. It is compatible with 5V and 3.3V power supply. **Features:** Low power consumption High sensitivity Tiny outline Responsive to a wide scope of target gases Cost efficient Durable Compatible with 5V and 3.3V **Specification:** Sensor： Winsen MP503 Power： 5V or 3.3V Dimension: 40x20mm **Documents:** Please visit our [wiki][4] page for more info about this product. It will be appreciated if you can help us improve the documents, add more demo code or tutorials. For technical support, please post your questions to our forum. For more detail, please visit: http://www.seeedstudio.com/item_detail.html?p_id=2439 [1]: /editor/20160711/5783ba0be23ea.png [2]: /editor/20160711/5783ba10f1928.png [3]: /editor/20160711/5783ba14a3296.png [4]: http://www.seeedstudio.com/wiki/Grove_-_Air_Quality_Sensor_v1.3