Wide Compatibility--Doorbell solar charger is suitable for most video doorbell including Video Doorbell 3 / Video Doorbell 3 Plus / Video Doorbell 4 / Video Doorbell (2020 Release) / Battery Doorbell Plus. (Doorbell Not Included). Adjustable Solar Charger--120°Adjustable mounting bracket allow you to adjust the position of the solar panel to any angle and maximize the sunlight exposure. High Conversion Efficiency Charger-- 3 solar panels to ensure multi-directional and maximum absorption of sunlight providing a sustainable solar energy for the doorbel. The effective conversion rate of this solar charger is 4.3 times higher than average solar charger due to built-in high-efficiency monocrystalline cells. IP53 Waterproof Panel--Made of IP53 polycrystalline silicon, equipped with professional dust covers, this doorbell solar panel is dust-proof and waterproof. It can be operated on conditions is -4°F to 131°F(-20°C-55°C). Suitable for any environment to use. No worry abo