The 1200mA power adapter supplied with me a Blackberry docking station for the Z10. The smartphone is fully charged in about 1.5 hours, about twice as fast as like with the original power supply. The OTB PSU not humming during operation, the Micro USB plug wobbles not u. The output current is OK. Is still a red LED for indicating the operating status at the top of the unit. The power adapter is well made and I am running smoothly for half a year; I would therefore buy it again.