Longest functioning tin can telephone
Roy Hobbs Inc., SUSUMU Inc., Puzz Lab Inc., Gakken Plus Co.,Ltd., Hirofumi Yumoto
242.626 metre(s)
Japan (Choseigun, Chiba, Japan)

The longest functioning tin can telephone is 242.62 m (796 ft), and was achieved by Puzz Lab Inc., SUSUMU Inc., Gakken Plus Co. Ltd., Roy Hobbs Inc. and Hirofumi Yumoto (all Japan) in Chosei, Chiba, Japan, on 17 August 2019.

They were not only successful but also the very first holder of this record title.