XL-MaxSonar-EZL0 MB1260 Ultrasonic Distance Sensor

The MB1260 XL-MaxSonar-EZL0 sensor features centimeter resolution and a 10Hz read rate, and provides short to long distance detection, range information from 25cm to 1068cm. Besides, this sensor has the widest and most sensitive beam pattern of any unit from the XL-MaxSonar-EZ sensor line and includes various output options: pulse-width, analog voltage, and RS232 serial.
This makes the MB1260 an excellent choice for use where high sensitivity, wide beam, or people detection is desired.
The MB1260 from the XL-MaxSonar-EZ line of sensors is a very small, less than one cubic inch, ultrasonic sensor component module. This sensor comes with mounting holes provided on the circuit board for easy installation in nearly all applications.
In addition, the MB1260 offers virtually noise free distance readings through the use of high-output acoustic power combined with continuously variable gain, real_x001e_time background automatic calibration, real_x001e_time waveform signature analysis, and noise rejection algorithms. This holds true even in the presence of many of the various acoustic or electrical noise sources.

For more details, see the datasheet here