When I had a Ericsson R520, I had a micro travel charger for that phone. However, now I use a Sony Ericsson K510 and I wanted to replace the AC adapter with a micro charger. I prefer this over the corded charger because it's more compact and less messy. I travel often and have found myself on several occasions need to recharge the phone (such as at the airport, on the train). Since an electric outlet is not always available, the feature using AA battery power source is very useful. I give thumb up to the designer of this device. So far, it already helped me to make important calls when the main battery was depleted, it's worth the price.