20 tens, or 2010, equals 200 as the answer.
A modest electrical current is used in transcutaneous electrical nerve stimulation (TENS), a technique for reducing pain. A TENS machine is a tiny, battery-powered gadget with electrode leads that are wired to sticky pads. The pads are immediately affixed to your skin.
According to studies, using TENS for at least 30 minutes while being active is the best strategy for treating chronic pain. When you're resting, lying down, or just sitting motionless, it works less well.
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