According to NASA (and many user reviews), cordless anti-static wrist straps simply don’t work.
This iMBAPrice Anti-Static Adjustable Grounding Wrist Strap Components in Black and Yellow Color (RTK-002-MHL). The insulation of the grounding wire
iMBAPrice Anti-Static Adjustable Grounding Wrist Strap Components Black, Yellow
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NASA: Wireless Anti-Static Wrist Straps Don't Work
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Eco-Fused Anti Static Wrist Straps - 3 Pack - Reusable Anti-Static Wrist Straps equipped with Grounding Wire and Alligator Clip - Enables you to
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