I also use the TDK700 headphones,work very good on my T2,DFX,Tesoro and my Pulse,they do give you some form of freedom,one thing i will highlight with them is that if no noise comes from the detector the TDK headphones shut down after 2-3minutes to save batteries but all my machines that i have mention have a constant threshold hum so they dont swotch off.
As these headphones are not bluetooth then no noticable delay is heard which of course is the biggest problem with the bluetooth option,i am pleased overal with the TDK phones,they do have a small transmitter than plugs into the headphone socket but i normally use a 6-8'' extension cable and plug the transmitter into that,this allows me to mount the transmitter better and out of possible harms way.
No after market wireless headphone setup is perfect but i find these TDK ones nearly as perfect and they certainly get my vote,battery life is i am finding about 20 hours but its wise to carry spare ones with you just incase,of course do you own research and make the final decison as what works well for me may not work for other folks.