Generally speaking, penis pumps are all safe to use. An electric pump may be considered safer if it includes a quick air release valve as well as an air gauge to monitor the vacuum pressure in the pump cylinder.  If you have a manual pump with these features as well as an electric pump with the same features, there is not going to be one that is safer than the other. The big benefit is going to be the ease of use with the electric pump over manually pumping. To read more about the safety of penis pumps, check out our penis pump FAQ.