Attention: Please check voltage and amperage rating on the bottom of your laptop before placing your order, which looks like 19V --- 2.1A. Acer GATEWAY LT2108U AC adapter charger is safe to use within +/- 1V of the laptop voltage. It is safe to have a higher amperage. Do NOT purchase an AC adapter with a lower amperage than is listed on your laptop. Please make sure the tip size also matches your DC output.