The LHPC-A11 is a handheld airborne particle counter with six microcomputer-controlled channels for detecting particles in various size ranges. It features an audible alarm, high-resolution LCD, large data storage, and options for optional sensors, making it suitable for clean room monitoring and indoor air quality testing. The device has a flow rate of 0.1 CFM, operates on a lithium battery with over 8 hours of life, and can interface with USB for data communication.