Looks like TENS electrode pads (industry-standard 3.5mm snap-on connectors) are the new trackrs. Just got 90 in my irk if you want any

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Says this โ€œStandard 3.5mm Snap-on Connector: Our ๐ญ๐ž๐ง๐ฌ ๐ฎ๐ง๐ข๐ญ ๐ž๐ฅ๐ž๐œ๐ญ๐ซ๐จ๐๐ž ๐ฉ๐š๐๐ฌ are compatible with TENS of brand Belifu, NueMedics, TECHCARE, NURSAL, MEDVICE. Best replacement pads fit for all TENS device which uses the industry-standard 3.5mm snap-on connectors. {๐—ก๐—ผ๐˜๐—ฒ: ๐—ก๐—ผ๐˜ ๐—ฐ๐—ผ๐—บ๐—ฝ๐—ฎ๐˜๐—ถ๐—ฏ๐—น๐—ฒ ๐˜„๐—ถ๐˜๐—ต ๐—ข๐—บ๐—ฟ๐—ผ๐—ป ๐—ฑ๐—ฒ๐˜ƒ๐—ถ๐—ฐ๐—ฒ๐˜€.}โ€

โ€œReusable Electrodes:Our pads are washable and reusable, up to 35 times reusability by using in right way. If the ๐ญ๐ž๐ง๐ฌ ๐ฎ๐ง๐ข๐ญ ๐ž๐ฅ๐ž๐œ๐ญ๐ซ๐จ๐๐ž ๐ฉ๐š๐๐ฌ contaminated with dust or dander, you can rinse the pads with running water and dry it natrually, it will be sticky again.โ€

This apparently can be used with any manufacture that uses this standardized industry standard 3.5 Snap-on Connector. I believe IQ uses it as does iPulse and likely moreโ€ฆ

These are free to anyone who wants them for postage.
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Screenshot of amazon picture.