High Sensitivity and Quick Response: This -2 Smoke Sensor Module is designed to detect a wide range of gases, including LPG, i-butane, methane, alcohol, hydrogen, and smoke. Ideal for enhancing safety in your home, garage, or workshop for Compatibility: for DIY projects and complex automation systems, providing a flexible platform for inventors and hobbyists Robust Alarm Function: Features a built-in alarm that triggers upon gas detection, offering immediate alerts to potential dangers, helping to prevent accidents before they occur Due to different batches, there may be differences in product appearance and printed text, which not affect use Color: As Shown Material: PCB Package Contents: 1 x Smoke Sensor Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.