Features: Stable and reliable,long service life. Fine workmanship and good performance. Have charging indicator light,when filled with the indicator lights was lighting. Output voltage:DC 450V output is voltage structure,the input voltage fluctuation,the output voltage constant. With an input undervoltage protection,voltage less than 7.6V undervoltage protection,please use the 12V power supply current of 7A or more. Specification: Power:70W (Continuous working:40W,intermittent work:70W) Input voltage:DC 9V -24V (12V Input time,Maximum input current 7A or more) Minimum input start voltage:8.4V Not recommended for use with a multimeter 9V laminated battery. Recommended for use with 12V power supply,more than 80W power supply,or about 7A power supply output capability,or lead-acid batteries,or without a protective plate 3 or 4 string string 18650 battery. Reference charge time:When supply current under sufficient conditions,1000UF capacitor charged to 450V ( reference charging time was 5 seconds). Used for magnetizing capacitor charging,DC power supply equipment,pressure testing,low-voltage DC power supply,glow tube power supply etc. Size:8.5x5x2.8cm/3.35x1.97x1.10inch Note: Please allow 1-3mm error due to manual measurement.pls make sure you do not mind before you bid. Due to the difference between different monitors,the picture may not reflect the actual color of the item.Thank you! Package includes: 1 x High Voltage Converter Board