This product is designed to extend battery operating time and reduce power consumption, helping keep your video doorbell running efficiently. Before using this product, remove the battery from the doorbell. Easy to install—simply route the cable through the door opening and connect it to your ring. Installation and setup can be completed in minutes. No existing doorbell or additional wiring is required, allowing installation on most doors. The cable length is 5 meters. Compatible with Nest Hello doorbell, Arlo video doorbell, Eufy video doorbell, Simplisafe video doorbell, Zmodo Smart Greet Wi-Fi video doorbell, and other doorbells that require an 18V adapter. Constructed with high-performance materials, this product features a smooth, sleek design. The outer casing is made of flame-retardant, impact-resistant PC-ABC material, safe for human contact. The power supply has an anti-slip matte finish and offers strong resistance to gloss, oxidation, and humidity. Built for durability, it is manufactured to strict standards with fully insulated layered winding, ensuring safety and long-term reliability.