The Lenovo 40 W AC Travel Adapter is a compact, portable power source for Lenovo Yoga 3 and 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 only compatible with Lenovo Yoga 3 and Yoga 3 Pro systems. It is highly energy efficient and is backed by a one-year warranty.