Why does the Audi e-Tron use a two-speed transmission?

I've noticed that most electric vehicles use a single-speed transmission, but the Audi e-Tron has a two-speed transmission. What is the purpose and benefits of using this type of transmission in an electric vehicle?

The two-speed transmission in the Audi e-Tron allows for a better balance between acceleration and efficiency. The first gear provides quick and powerful acceleration, while the second gear provides better efficiency at higher speeds.

The two-speed transmission is also necessary for the e-Tron's all-wheel drive system. It allows for better distribution of power between the front and rear axles, resulting in improved handling and traction. This is especially beneficial in adverse weather conditions.

One other advantage of a two-speed transmission is that it helps with regenerative braking. By using a lower gear, the e-Tron is able to capture more energy and recharge the battery while braking or decelerating.