http://www.eartec.com/tree_care.html
They are totally different then the Earmark head sets, (FYI the earmarks work awful with the KASK)
We attached the box to the climber’s saddle and he runs the wire inside his shirt and wears the headset piece under his helmet. We have been using them for several months now and haven’t had a problem with the wire. The Earmark setup is more convenient just having everything attached to the helmet but we just couldn’t justify using them anymore.
We had an incident with one Earmark headset where the climber ended up in a swarm of bees and they were under his helmet stinging him, he ripped the helmet off and broke one of the wires going into the headset. We sent it back and told them what happened (headset was about 2years old) Earmark called me and told me it was un repairable. They couldn’t understand why i was upset; a broken wire on a $800 headset and it couldn’t be repaired.
Right now we have a box of 5 earmarks and we have one working pair.
The Earmarks tend to pick up all sorts of static and if you don’t have good line of site they tend to have lots of interference.
The Eartec's scan for the clearest frequency each time you turn the on. Since we have had them we have had zero static, not even a crackle once.
We were so sick of dealing with Earmark if the Eartec's hadn’t worked out we were going back to the $40 4 packs of Motorola talkabouts and just throwing them away when they broke.
The technology is so far superior on the Eartec’s, we used the Earmarks for years and now that we have used the Eartec’s there is no way we will go back