Attention-- !!! , // / . Wide Compatibility--Doorbell solar panel charger is compatible with Ring Video Doorbell (2020 Release), , - -. (Doorbell Included). : This solar panel charger is only suitable for flat walls. curved walls or vinyl baseboards. 365 Day Power Supply--This solar panel charger with a powerful output (maximum power 2.9W 5V DC) and a maximum efficiency value of 19% providing continuous and stable power for your doorbell. 120°Adjustable mounting mount allow you to adjust the position of the solar panel charger to any angle and maximize the sunlight exposure. Efficient Solar Panel--3 solar panels to ensure multi-directional and maximum absorption of sunlight, providing a sustainable solar energy for the doorbell. Effe