Importer520 USB 2.0 A to Micro B Female/Male Adaptor For Nokia Lumia 521(T-Mobile) Brand New Generic Bulk Package Micro USB adapter lets you use a USB charger / cable to charge and sync devices with a micro USB power port. Male Micro USB to USB Female receptacle Fully support High Speed USB 2.0 specification NOTE: Some of the devices might NOT support cable's charging function by the factory setting. Please refer to the user manual for detail.