The Lenovo 40W AC Travel Adapter is a compact, portable power source for Lenovo Yoga 3 & Yoga 3 pro systems. Keep one in the office, one at home and another in your carrying case for convenient access to power. Plug it into an available outlet to deliver immediate AC power to your compatible Lenovo notebook. This adapter is compatible only with Lenovo Yoga 3 and Yoga 3 PRO systems. It is highly energy efficient and is backed by a 1-year warranty.