This is a 2021 model moving base running charger, 12V, which has been stored indoors with almost no use. Although it has hardly been used, there are some minor scratches due to indoor storage. The following is quoted from the website: This product is designed and developed to charge the auxiliary battery with electricity generated while driving. - It not only charges the auxiliary battery, but also allows power to be supplied from the auxiliary battery to the main battery in case of an emergency. - Voltage and current values can be adjusted. - Cut-off function after full charge. - It is the model before the one in photos 2 and 3. - Model: YSD-D8012B - Output voltage: DC8V-15V - Input voltage: DC12-20V - Output current: 6-80A - Efficiency: 87%-93% (maximum output 1000W) - Display: Digital display (voltage, current) Thank you for reading to the end.