118.– CHF
Canon TC-80N3
Cable
Canon TC-80N3
Cable
The Canon EOS 70D requires a 3.5 mm plug for the remote release, so not compatible
Only the EOS Ra from the EOS R* series is listed in Canon's compatibility table. The TC-80N3 requires an N3 interface.
Yes, it works on the 7D mark I and mark II.
The thing doesn't look very high-quality, can do the most necessary things and is not particularly intuitive to operate. It does what it has to do, no more. I don't think any non-Canon product is significantly worse, if at all.