smrroy er 5sd 12V HIGH QUALITY High Output Cleaner Negative Ion Anion Generator Power requirements: DC 12V Output voltage: -4Kv ~ -6Kv DC Power use: &lt;1W Size: 42*25*21mm/1.61"x0.82"x0.98" (L*W*H) Anion quantity:15million pcs/cc air at distance 5cm