Stroking up or down on the touch sensitive bar will change the speed of vibration. Pressing on the light up logo will give you a range of pulses and when you find the one you like, you can lock it in place by simply pressing the opposite end of the bar. The glowing light will show you which vibrating function you are using by lighting up in synchronization-Batteries{9} : None[190], 2 x AAA[188](+#0.58)