Input voltage: 36V 48V(36V - 48V) rated voltage Output Voltage: 12V Working Current: 20 amp Working Power: 240 watt Please note the power converter works with any battery packs of working voltage ranging from 36 volt to 48 volt but not higher or lower. The input voltage is preset from manufacture and it is non-adjustable. The Key Switch wire (thin red wire) is to be connected to the key switch behind the dash. If you don't have a lock switch, merge the two red wire together and connect both to positive input end. Measurements: 13.1cm*8.8cm*4.8cm 5.2''*3.5''*1.9''