Delta BreezSignature VFB25AX 80/110 CFM Dual Speed Exhaust Bath Fan, 0.5 Sone/1 Sone Energy Star Certified with DC Motor technology Noise level at 0.5 sone low speed/1 sone high speed Annual energy cost for 24/7 operation is approximately $8.26 to $15.32 Cycle switch ON/OFF for low speed and high speed mode Green and amber LED indicator lights to show low speed mode and high speed mode