The XL‑MaxSonar‑EZ2 is our most recommended indoor sensor. It offers the best balance between wide or narrow beams and provides a good balance between small and large target detection. The XL-MaxSonar-EZ2 works for nearly all indoor applications including: people detection, large-target detection, long-range detection, applications requiring high noise tolerance.The sensor is small in size, yet the high output acoustic power combined with continuously variable gain, real-time background automatic calibration, real-time waveform signature analysis, and real-time noise rejection algorithms results in virtually noise free distance readings for most users. This holds true even in the presence of many of the various acoustic or electrical noise sources. The XL‑MaxSonar‑EZ sensor line is factory calibrated to match the sensor beam patterns and provides a long range detection zone.