This is a weather resistant, field-hardened WR1 from Maxbotix. The XL series features longer range, better resolution, more power output and better calibration. This ultrasonic sensor uses a robust PVC housing, is designed to meet IP67 water intrusion, and matches standard electrical 3/4" PVC pipe fittings. This superb sensor provides very accurate readings from 0 to 765cm with 1cm resolution. The powering requirments range between 3.3 and 5VDC.