I didn't check for that,and, can't today,but, will monday, the parts book shows mechanical switches only. The battery was getting low on Friday after 1.5 hours of my work so I gave up the ghost and put it on Charge, the operator said that it would do this right after coming off the charger, but only after being used for 10 or 15 minutes straight, then fairly consistantly, let it set for an hour, you'd have to use it for 10 minutes again.