<B>Product specifications:</B><P> 1. Trapezoidal design, the center of gravity swings back, <BR>it is not easy to cause neck fatigue, and it is more ergonomic.<P> 2. The unique filter route design makes the adsorption effect better. <BR>Using high-quality activated carbon, long service life.<P> 3. American NIOSH certification<P> 4. Rotating bayonet design allows the interface to be more firmly connected to the main body for easy replacement.<P> <B>When to replace the filter cotton?</B><P> When you feel that the breathing resistance is obviously too large, <BR>the human body feels uncomfortable, Or when the filter dust becomes dirty or damaged, <BR>the filter cotton needs to be replaced.<BR> The filter cotton is generally replaced once every 5 days (according to Use the environment to extend or shorten the service life)<P> <B>Product packaging:</B><P> 2 filter boxes + 2 filter covers + 8 filter cotton