ALINCO DT-840M DC-DC converter, maximum 10A output, 24V input compatible. - Brand: ALINCO - Model: DT-840M - Maximum Output Current: MAX 10A - Maximum Input Current: MAX 6A - Fuse: 20A - Input Voltage: 24V I've forgotten when I purchased this item, but I haven't used it for about three years. I confirmed today that it powers on, please check the last photo. Also, as a bonus, I'll include a CELLSTAR 24v to 100v converter. I also confirmed that the fan on the back is running when it's powered on, so I think it's fine. By the way, both were able to charge a cell phone charger. However, please understand that this is a used and old item before purchasing. m(_ _)m