This product is compatible with various video doorbells that require an 18V adapter, including Nest Hello, Arlo, Eufy, Simplisafe, and Zmodo Smart Greet Wi-Fi models. Designed for durability, it helps extend battery operating time and reduce power consumption, supporting continuous performance of your video doorbell. Before installation, remove the battery from your doorbell unit. The device features a 5-meter cable and allows for quick and easy setup—simply route the cable through the door opening and connect it to your doorbell. No existing doorbell system or additional wiring is required, enabling installation on most doors. Constructed with high-quality materials, the outer casing is made from flame-retardant, impact-resistant PC-ABC, safe for human contact. The power supply features an anti-slip matte finish and offers strong resistance to gloss, oxidation, and humidity. Built to strict manufacturing standards, the internal wiring is fully insulated with layered winding technology, enhancing safety, durability, and long-term reliability.