Compatibility: Compatible with eufy Robot Lawn Mower E15, E18 and C15. Built to Last: This extension cord is waterproof and UV-resistant to withstand outdoor conditions, including exposure to sunlight and stress. Safety Tips: To prevent accidents, ensure the cord is properly laid out to avoid contact with the lawn mower blades. It should also be securely anchored or buried in the lawn to prevent it from being cut by trimmers and other lawn maintenance tools. Easy to Install: Just align both ends and rotate to fasten securely. Use Official Accessories: Authentic eufy accessories extend the lifespan of your robot lawn mower and come with official after-sales support.