Description Specifications: ZY-S1's pipeline crawler is Chinese top 3 crawlers ZY-S1''s pipeline crawler has magnetic control syste Feature: Locate accurately Performance good while welding machine working Get back itself while meet with water, over-voltage, over-current, and over-heat If under low powler, or without signal within 30mins, the crawler will get back itself X ray densityis consistent even under low power Acid lead bettery, can store 30% more energy, and resist higher temperature and avoid explosion