· Wide Compatibility---Doorbell solar panel charger is 𝐨𝐧𝐥𝐲 compatible with 𝐀𝐥𝐥-𝐧𝐞𝐰 𝐑𝐢𝐧𝐠 𝐁𝐚𝐭𝐭𝐞𝐫𝐲 𝐃𝐨𝐨𝐫𝐛𝐞𝐥𝐥 (𝟏𝐬𝐭 𝐆𝐞𝐧𝐞𝐫𝐚𝐭𝐢𝐨𝐧 - 𝟐𝟎𝟐𝟒 𝐑𝐞𝐥𝐞𝐚𝐬𝐞) with a 𝐔𝐒𝐁-𝐂 power connector. 𝐖𝐚𝐫𝐦 𝐓𝐢𝐩𝐬: This solar panel charger is only suitable for flat walls. 𝐍𝐨𝐭 𝐟𝐨𝐫 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. Effective conversion rate of this solar panel charger is 4.3 times higher than average solar panel charger due to built-in high-efficiency mono-crystalline cells.· Disassembly-free Charging - Thrown out the time-consuming and laborious separating charging method! Try this efficienta environmental-friendly solar charger! This solar panel charger does not need to be removed frequently for charging, which is more convenient and saves you more time.· Attention---The solar panel charger is an environmental friendly devices. Please note solar panel charger need to be exposed to the direct sunlight each day for more than 4 hours. The charging efficiency depends on the intensity of the sunlight and the rate of power consumption of the doorbell.