StopWatt is a real plug-in power-factor correction device, and this domain is the official store — orders are fulfilled and refunded by us, not by a reseller. We publish no savings percentage and no celebrity endorsement, and every order carries a 60-day money-back guarantee.
It supplies part of the reactive current used by motor-driven appliances such as pumps, compressors and HVAC units, which lowers current in your wiring. Results depend on your home's appliances, so we ask you to compare a full billing cycle against last year's kWh and return the units if nothing changes.
It is a plug-in power-factor correction device. Internal capacitors supply part of the reactive current used by motor-driven appliances, which reduces current in the nearby wiring.
We do not promise a savings figure. US residential meters bill real power in kWh, so any bill impact comes from reduced in-home losses and varies by home. Test it for a billing cycle and return it within 60 days if you are not satisfied.
Roughly one per 800–1,200 sq ft, with extra coverage near large motor loads and on each floor.
Orders leave our warehouse in 1–2 business days. Delivery typically takes 3–7 business days in the USA and 7–15 business days internationally, with tracking emailed on dispatch.





