So I really like these and from what I have read they are a solid set of wireless headphones that many seem to use for metal detecting.
TDK WR700 Wireless Headphones
Looks also like they employ the needed "Kleer Technology" (Not Bluetooth) as well for fast lag free sound.
I like the look and potential feel of how they look along with the nice transmitter and the fact it already has the 3.5mm TO 1/4" adapter and it ready to go.
I uses x2 AAA batteries and not rechargeable which may make them heavier but they cant be any worse then the heavy beast of headphones metal detectorist normally use.
And x2 AAA batteries in the transmitter as well adding a tinge more weight to your detector ... but I doubt enough At All to notice!
Nice little easy to access push power button on the side when you want to turn them off maybe if you detector is chattering to much while digging (that may be nice).
Plus same are has the push button volume up and down for easy control of volume without going into menus on the detector to do so like other standard detector headphones normally have.
They are over twice the price of say the Rapoo ones but seems to be built better and a little more quality overall I think and may be worth that price if they work the way they should.
ALSO these are actually so nice they can also be used for at home personal use as well .... the transmiiter will work with iPhones, MP3 Players, stereos, laptops, tablets and other devices to wireless stream audio from a 3.5mm or even a 1/4" (with adapter) stereo output to these headsets .... that is nice as well to know you have if ever needed.
And can be had for about $110 on eBay .....
TDK WR700 Wireless on Ear Headphones Hi Fi Stereo Headband Kleer Bluetooth 3 5mm 020356617905 | eBay
Anyone have any thoughts on these or do you use them? I have read some user here on TN have them ... if you do please chime in and let us know how you like them and how they are working and holding up 
Thanks so much and I look forward to seeing more about these.
Product Information:
Enjoy listening to music wherever you are without being tethered to a cord or cable with the TDK WR700 over-the-head wireless headphones that render powerful and precise aural resonance. Built using the Kleer’s proprietary wireless audio technology, these TDK headphones deliver exceptional acoustics with amazing clarity. Moreover, you can seamlessly sync these over-the-head wireless headphones with your CD players, MP3 players, and other audio devices by simply plugging in the transmitter. As the 16-bit 44 KHz digital audio signal is preserved during transmission, these TDK headphones deliver flawless stereo sound output. What’s more, with the vibrant channel selection feature, the TDK WR700 headphones minimize drops to render excellent reverberation.
VIDEO REVIEW:
Not of course shown a detector but just the headsets themselves so you can see what they look like and how they work.
Some pics for your reference .................
Features:
Wireless headphones
2.4GHz transmitter
Jack extension cord
Cloth bag for headphones
Four AAA batteries
Kleer does not compress the audio prior to transmission Wireless:
Uses the 2.4GHz band.
Transmitter monitors interference and switches to another channel if necessary.
10m Power Consumption
Two AAA Batteries provide 30-40 hours of listening time
Driver Diameter: 34 mm
Frequency Response: 20-20,000 Hz
Sensitivity at 1 kHz: 106 ± 5dB Input impedance: 32 ± 10% ohms
