The Digital Wig-L-Bug features a keypad programmable timer (0 to 30 seconds), and can be programmed on the keypad to run at four speeds: 3800, 4200, 4600 and 4800 RPM. This Model uses a polymer threaded screw type vial and a stainless steel ball pestle which comes with the unit. An optional stainless steel liner for the polymer vial is available. (Accessories for the standard Wig-L-Bug are not compatible with this model). Electrical: 120 volts, 60 hertz.