Price:
US$10.99
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AC220V Power Supply Adapter for Video Ring Doorbell EU Plug 
Detail Pictures:
Features:
– To solve the problem of "Low batter".
– Run the 5 meters wire along the wall from the outlet to the doorbell.
– Easy to installation: Just connect the 2 copper wire tips to the screws on the bracket of the doorbell.
Specifications:
Color: Black
Plug: EU plug
Input: AC 220V 60Hz
Output: AC 18V 500mA 9W
Wire length: 5m
Package included:
1 x Adapter
Detail Pictures: