1. 【Compatibility】 This solar panel with USB-C charging port is perfectly compatible with Ring Battery Doorbell (2024 release), no need to disassemble the bracket, easy to install. This product only works Ring Battery Doorbell with a USB-C power connector and other brands of doorbells that charge with a USB-C port. 2. 【Built-in Rechargeable Battery】This solar panel has a built-in 4000mAh rechargeable battery, even in cloudy and rainy weather without the sun, you don't have to worry about not being able to charge it, the built-in battery can supply power to your device to ensure that your camera is constantly on the power supply; the use of high-quality battery core, power lasting, longer service life; 3. 【Built-in Voltage Regulator】This solar panel has built-in PCB intelligent protection circuit with multiple protection: over-voltage, over-current, over-charging, over-discharge, short-circuit, anti-reverse and other multiple protection; 4. 【Design highlights】 solar panels on the back of the design of the indicator, a more intuitive view of the charging status, red light - solar panels in the built-in battery power below 20%, yellow light - built-in battery power more than 20%, blue light - built-in battery power more than 50%; the use of ultra-thin charging cable design, the thickness of only 0.02 inches, can be completely tightly adapted to the doorbell and the bracket, do not need to dismantle the bracket, the installation is simple! 5. 【Product Parameters】 The power of this solar panel is 3W, built-in 4000mAh rechargeable battery; UL2464 certified charging cable, 13.2 feet (4 metres) long, with an output voltage of 5V, waterproof rating of IP65, with an ETFE protective film on the surface, with a conversion efficiency of more than 23%, and USB-C charging interface; 6. 【Included Items】 1 x solar panel (built-in 4000 mAh battery with 13.2 ft charging cable), 1 x stand, 3 x screws, 1 x 6-language instruction manual, 1 x positioning sticker，30 x wire codes 7. 【Attention and Service】 In order to ensure the normal power supply of the solar panel, please place the solar panel in a place where the sunlight can reach it. We also provide free maintenance service within 12 months from the date of purchase. If you have any pre-sale and after-sale problems, please contact us in time, we provide 7X24 hours email service, we are happy to help you solve any problems. 8. Note: When the solar panel indicator light turns off or flashes red, the solar panel is charging its built-in battery and will stop supplying power to external devices. Please do not worry, when the built-in battery reaches the voltage required to supply power, it will resume supplying power to external devices. Transform your Ring doorbell power supply system with this innovative solar panel, which is equipped with a 4000mAh built-in rechargeable battery. The 0.03-inch ultra-fine cable of the solar panel can extend up to 13.2ft/4 meters, providing flexible installation options without affecting the aesthetics of the doorbell. This 3-watt solar panel integrates an advanced PCB circuit with nine complete protection functions, including overcurrent protection, overcharge protection, over-discharge protection and overheating protection. The IP65 weather-resistant structure ensures reliable operation in various outdoor conditions. It measures 17×12×4 cm and weighs only 400 grams. This elegant black and white solar panel offers a variety of installation options. The USB-C interface ensures modern compatibility, and the built-in battery can continuously power your device even during long winters and rainy days. This solar panel is perfect for powering battery-operated doorbells with a USB-C charging port. It is easy to install without removing the bracket, providing a reliable continuous power supply solution for your smart doorbell.