With SilentTech™ technology, this machine reduces the sound level to 60±3 dBA in Quiet Mode, making it ideal for daytime cleaning in sound sensitive environments. Simple to operate it is activated by pressing the OneTouch™ Scrubbing button. The built-in sensors in the machine's handle acknowledge the operator's presence and the machine is engaged. The Electronic Solution flow control is mounted on the control panel within easy reach to adjust while in use to accommodate changing floor conditions. To prevent dry scrubbing and possible damage to the floor, the SC401 offers a brush pre-wet feature.