I don't know if this exact one is still available. Check http://www.adorama.com/ZZAC.html This one produces 4 volts at the 1.5 volt setting!!  Our laser wants 4.5, runs fine on 4. If I had started at the 4.5 volt setting, I would have gotten 8 volts at the laser head - and that would be one dead laser! Maybe volts are different in China??  The one listed at Adorama no longer shows the 1.5v setting - - you may want to have them guarantee the output levels BEFORE you order. As long as you get 4 to 4-1/2 volts somewhere, it's OK! Check it before you plug it into your laser!