Hi Heather I have now received my Labour TENS machine and was wondering how I purchase additional pads as my sister is also pregnant and wants to use it later. I know that it comes with 4 but I was told you cannot share pads. I was wondering how to purchase additional ones. Thank You Angela Hi Angela, Good question. That's correct you must not share electrode pads for hygiene reasons. purchase an extra set via phone 1300 855902 or online. Each set of 4 costs $20 including P & P. Regards, Heather