Use and Care Manual

www.longer3d.com [e-mail]
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Thank you for purchasing LONGER products! Under normal usage
and service, the products and its parts have a warranty period up to
one year. If you encounter any problems, please send an email to
support@ longer3d.com to report any issue with LONGER products.
Our professional after-sale service would respond within 24 hours
and help you to solve the issues.