A Quick look at the Canon TC 80N3 - Gear Bits - YouTube
Amazon.com : JJC TC-80N3 Intervalometer Timer Remote Shutter Release Time Laspe for Canon EOS R5 R3 5D Mark IV III II 6D Mark II 7D Mark II 5Ds R 1Dx Mark III
Amazon.com : JJC TC-80N3 Intervalometer Timer Remote Shutter Release Time Laspe for Canon EOS R5 R3 5D Mark IV III II 6D Mark II 7D Mark II 5Ds R 1Dx Mark III