This charger works well and avoids having to handle too little protective flap on the compact Z3. Care must be taken to respect the order otherwise the connection cable will not be recognized by the phone: 1. Connect to the first wall charger 2. Then connect the phone (Thank you David for your comment, otherwise we could not run the cable) It is my husband who uses it. Compared to the loading speed, I do not know if it's faster than USB or not.