Delta BreezSlim VFB070B3X1 50/70 CFM Dual Speed Exhaust Bath Fan, 1 Sone/2 Sones Energy star certified with dc motor technology Noise level at 1 sone low speed/2.0 sones high speed Annual energy cost for 24/7 operation is approximately 6.73 to 13.78 Green and amber led indicator lights to show low speed mode and high speed mode The only 7.5-Inch x 7.25-Inch small size energy star certified bath fan in the market