Available only from Hammacher Schlemmer, this is the cordless handheld massager with six interchangeable heads that deeply penetrate fatigued muscles and loosen stubborn knots. Unlike wired units that keep one tethered to an outlet, this model is powered by a Lithium-ion battery that provides up to 90 minutes of soothing vibrations. It operates at three speeds—from a steady Swedish-style tapotement to a vigorous vibration of up to 3,200 rpm—that can be applied with as little or as much pressure as one desires. Safe for use on the whole body, the device’s interchangeable attachments include a spherical head, curved head, and scalp massager. Automatic shut-off after 15 minutes. Includes storage bag. Charges via AC adapter.