Lowest cost ultrasonic ranger with both I2C and Serial interfaces. New AutoTune algorithms intelligently back the minimum range right up to the transducer ringdown for the very best performance possible, automatically, in the background, and with no calibration cycles necessary. Additional new commands allow for separate burst and ranging control.

Range - 20cm to 6m.
Power - 5v, 4mA Typ.
Frequency - 40KHz.
Size - 24mm x 20mm x 17mm height.
Communication - Standard I2C Bus or Serial Bus - connects up to 16 devices to a serial port
Timing - Fully timed echo, freeing host controller of task.
Units - Range reported in uS, cm or inches.
Weight - an incredibly light 4.6gm

Resources:
Technical Data
Example Programs