For use "zapper" as defined by H. Clark, the device must be used with a direct current with a 0.25V offset. How is your Spooky 2-XM in "contact" mode (with the tubes) usable while it is powered by 220V? Penny Yu April 16, 2018 01:50 Follow Our XM generators are powered by a 5 VDC power supply. Internal power supplies boost this to 20 Vpp. Have more questions? Submit a request 0 Comments Please sign in to leave a comment.