Keywords: TR509, swimming earphone, cable, short, not long
It is designed to use with waterproof MP3 player as a professional swimming set. For wimmers, MP3 will be clipped on the swim cap or glasses band. So cable over 40cm will cause tangling while swimming. Wearing effect is like the following.
If you don't got a waterproof MP3 device and it is too short for your mobile phone in waterproof pouch, please use the waterproof extension cable included in the package.