Turn-off Function: Through MCU, its SHDN pins will be pulled high to turn it off. Adjsutable Output Voltage: 150V-220V. MAX1771 program. The package includes:Acxico 1 Pcs Nixie Tube Power Supply Boost Module 12V to 150-220V MAX1771 for SZ3-1 QS30-1 ; We are very grateful for all customers' opinions to improve s, if you are not satisfied, please contact us to find the best solution