Backyard Brain's Human-Human Interface Assembly

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Plug the battery back into the SpikerShield, first making sure the TENS unit is turned off. Now turn on the TENS unit carefully, turning the dial to no higher than "2" at first. Slowly turn up the settings on the TENS Device, one number at a time, to the needs of the controlled volunteer.
As the controller flexes his/her wrist, the controlled volunteer should feel a twitch in his/her forearm. It may be slightly uncomfortable but should not be painful. This usually occurs at about 3 on the power dial.

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