Feature: 1-Preset speed mode(high-mid-low speed) 2-Agentle ,pulsed stimulus begins to increase at a rate specifically designed for patient comfort. 3-If the patient indicates perception,simly release the buttonthe stimulus stops immediately,bu the numbers remainfrozen on the screen for about 3 minutes.4-Specifically designed for patient comfort.5-Convenient to operate. 6-Maximum stimulus .80.between O-40,the patient feeisache and anesthesia,alive teeth nerve. 7-Between 4O80,with above-mentioned reaction,partofteeth nerve dead;80,no above-mentioned reaction,deadteeth nerve. 8-The device turns itself off in three minutes after operation(No wasted batteries)