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Elecfreaks Octopus Smoke Sensor MQ-2 Brick OBMQ2 Octopus Electronic Bricks, you can use them build electronics projects just as easy as piling bricks. By using Octopus electronic bricks, you may connect Arduin Product #: newdigitalhk-Elecfreaks Octopus Smoke Sensor MQ-2 Brick OBMQ2 2024-09-29 Regular price: $HKD$62.0 Available from: New Digital StoreIn stock