I've found three stereo handsfree remote controls that (should) work with the W810. If you have experience with any or all of these, please post it to this thread
two-part design; could be too heavy/floppy for gym use
poor clip design and location - identical to the HPM-70, which causes the mic to hang awkwardly and the wiring to bend 180° can't find a US seller that has these in stock (yet?)
not OEM - may have compatibility/usability problems
appearance/finish does not match phone (no black+orange)
apparently discontinued or sold out?
clip looks very cheap (just a non-moving chunk of bent plastic)
I apologize if this is something of a repost. I found precious little via the Search function, unfortunately