Yealink SIPPWR5V.6A-USB-AU USB Power Supply, Power Capacity 5V 600mA, Black Colour, Designed for Yealink Dect W53 and W56H Phone. The Yealink SIPPWR5V.6A-USB-AU is a USB power adapter with 5V 600mA power capacity and designed to work accurately with Yealink Dect W53 and W56H Dect cordless phone.