This is a nice small package. Its actually smaller than the sugar cube speakers esu sells. It has a good capacitance, it keeps my loco running for a good 5 sec or so sound and motor! Worth the price.
Installed the new style keep alives into 3 Blackstone k-27s and 2 into Blackstone c-16s with info found on the net. Less than an hour each even taking your time. No more stalls at all.