Neewer Vision 4 300W Li-ion Battery Powered (700 Full Power Flashes) Outdoor Studio Flash Strobe with 2.4G System(Trigger Included), German Engineered for Location Shooting, 2 Packs Li-ion Battery

Q: Is this strobe capable of High Speed Sync?

No... to be able to use HSS you would need to buy Vision 5 which I also have and it works great. I have also used this one together with the Vision 5 as two strobes.

Q: este producto es compatible con las camaras cano 70d ?

Si, con todos los modelos, el radio es universal y también funcional con fotocelda

Q: Will the trigger work with other neewer transceivers.? i would set up the second as a slave but it will be in a softbox.

The triggers will work with other of this model strobe. I have two and I use one trigger for both. Not sure if that's what you are asking, but feel free to ask if I this wasn't helpful.