The MaxSonar-EZ1 offers very short to long-range detection and ranging, in an incredibly small package with ultra low power consumption.  The MaxSonar-EZ1 detects objects from 0-inches to 254-inches (6.45-meters) and provides sonar range information from 6-inches out to 254-inches with 1-inch resolution.  Objects between 0-inches and 6-inches range as 6-inches.  The interface output formats included are pulse width output, analog voltage output, and asynchronous serial digital output.