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This 18V replacement power supply is compatible with Amazon Echo 3rd Gen, Echo R9P2A5 Smart Speaker The factory-fitted integrated plug fits a UK 3-pin wall power socket. Please note: This 18V power supply works for the listed items only, please check your Amazon device needs 18V before you buy. Not sure? Just ask us, and we'll help you. Both the power specification and the tip size of this power adaptor make it fully compatible with the Echo 3rd Gen, Echo R9P2A5 Smart Speaker - it is the correct voltage, amperage and connector diameter. It includes electrical noise reduction, heat reduction and over-voltage protection, keeping your Smart Speaker powered and safe Designed with a more efficient delivery of power to your devices in mind, at less cost to you