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. Name:Power supply adapter for video doorbell Model:180500 Cable Length:5M Input: EU: AC 230V 50Hz UK: AC 230V 50Hz US: AC 120V 60Hz Output: AC 18V 500mA Plug Type:UK plug,it applies to Malaysia, the United Kingdom and so on. Material:plastic colour:black Voltage: AC230V Package Contents: 1 Adapter Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.