... some public places,ect... Features of 1-2g/h portable ozone generator:1. Ozone output adjustable: 0%-100%2 ... supply system, air blower, stainless steel shell, voltmeter, cooling fans, timer (or concentration regulation), light, switch components. More ... the precision filter, drainage electromagnetic valve, drying system, cooling fans, control system, stainless steel shell, ammeter, voltmeter and ...