The Auto*Therm 391 is a portable pulsed and continuous shortwave diathermy unit. The basic design comes with two (12 x 18 cm) soft-rubber plate capacitive applicators with flexible cables, six felt spacers, two cloth covers, two elastic straps, power cord and instructions. Auto*Therm 391 combines the 390 with an arm, inductive coil applicator and heavy-duty cart with ample storage space. 390 Dimensions: 7"H x 14"W x 16.5"D. 391 Dimensions: 37"H x 19"W x 19"D.