1、Adjustable Airflow: The airflow is adjustable at 10‑30L per minute, can effectively remove the smoke and dust generated during laser cutting or engraving to ensure the best engraving effect. 2、Good Protection: The air pump prevents the laser energy from decaying and the lens contamination caused by smoke and dust, ensures the stability, improves the service life and cutting efficiency. 3、Cooling Down: The powerful airflow can quickly and effectively reduce the surface temperature of objects during the engraving and cutting process, prevents excessive burning, makes the edges cleaner and sharper. 4、Low Noise: Only 45db of noise is generated during the working process, which is similar to the volume of household electric fans when working, providing you with a quiet environment for laser engraving and cutting. 5、Compatible Machines: This air assist pump is compatible for Two Trees Totems TTS A5 pro S9 S6 Pro, for Master2 Pro S2 SF, for Master2 S2 SF, for Reizer 20W, for LE400PRO, for L5, for LE 1. Item Type: Laser Engraver Air Assist Pump Material: Aluminum Alloy Noise Decibel: 45db Air Output: 10-30L per minute adjustable Air Speed: 3.3-3.5m per second Compatible Focal Length: 20-30mm Size: Approx.175x66x80mm/6.9x2.6x3.1in(length x width x height) Compatible Machines: For Two Trees Totems TTS A5 pro S9 S6 Pro, for Master2 Pro S2 SF, for Master2 S2 SF, for Reizer 20W, for LE400PRO, for L5, for LE 1 1 x Laser Engraver Air Assist Pump 1 x Reducer Pneumatic Connector 1 x Control Valve 1 x Silicone Tube 1 x Blow Block 1 x Blackout Acrylic 1 x PU Tube 3 x Hex Wrench 8 x Screw 2 x Plug 1 x Storage Bag 1 x Adapter