Unique item causes a motor shaft to turn on and off to spin a paper or stiff card that the shop keeper could write "Sale", "Specials", "New", Discount", etc. on. Has built in circuit board that sends pulses to motor mounted on metal battery holder. Operates on 2AA batteries (not included). Size about 1.5" x 2.6" x 1.8" tall (excluding shaft). Shaft of motor is 0.44" long x 0.06" dia. You simply write your message on a small piece of paper or stiff card and tape it to the shaft, install batteries and it works. Uses very low current so batteries can operate it all day and night! New.