Ring doorbell 4 review

【5 Modes Motion Sensor Alarm】Not only serves as a motion sensor to detect alerts but also has other functions. Welcome / Doorbell / Alarm / Color light / Lighting Model. Motion detectors are essential in a home security system. Doorbell chimes can detect movement in the surrounding areas – driveways, front porches, gates, homes, sheds, offices, walkways, swimming pools, stores, etc. And trigger an alert to the linked receiver.
【36 Ringtones & 5 Welcomes Doorbell Rings Languages】5 welcome languages are selectable in welcome mode. 36 ringtones selectable in doorbell mode. Welcome/doorbell/Alarm model has 4 level volume adjustable. Color light/ Lighting mode is silent and has 4 levels of brightness adjustable. Great for people with hearing disabilities or if there is a sleeping baby in your house. The color light model also has 4 colors selectable.
【Sensitive & Wide Wireless Range】The motion sensor doorbell entry alert door chime for business stores catches movement from a broad scope of space, with a working Range of up to 280m/918ft between the receiver and motion sensor. The detection range of the infrared sensor is approximately 2-8m/7-26ft to keep you informed and safe. You can put the motion sensor detector on the porch, gallery, or mailbox and put the receiver in your house.
【Expandable Wireless Home Security】Flexible design according to your actual needs. You can choose the quantity of transmitter and receiver you like, which can be freely matched and set special lights or ringtones with each other. Each receiver of this motion sensor alarms for elderly an alarm and can work with 32 motion sensors and 8 remotes at most. (Remote Extra Purchase ASIN: B07HQS5G5V) While wireless door chime is suitable for outdoor applications, please note that it is not waterproof.
【Easy to Install & Use】The wireless doorbell can be used by connecting USB port or installing it with batteries（infrared sensor needs three AAA batteries and receiver need three AA batteries)to make it work. Both the infrared sensor and the receiver have a mounting base. The motion sensor doorbell can be rotated 360 degrees from left to right and 180 degrees from top to bottom. So easy to install and can rotate to any position you need.

Smart Four Bell Outdoor Unit Designed for Multi-Flat Access Control: This 4-bell outdoor door lock unit enables secure and independent communication with four individual flats or offices, ideal for residential buildings and complexes.
Built-In IR Camera for Day & Night Video Surveillance of Visitors: Integrated IR night vision camera captures clear visuals even in complete darkness, helping you identify and monitor visitors 24/7 for enhanced entry-level security.
Weather-Resistant Slim Design with Included Rain Cover for Protection: Engineered for outdoor durability, this door lock unit features a sleek, space-saving design along with a rain shield to prevent damage from harsh weather conditions.
Two-Way Audio Communication System for Safe Visitor Interaction: Allows real-time intercom functionality between residents and visitors, ensuring safe screening before access is granted through voice confirmation.
Supports Remote Door Unlock with Video Door Phone Integration: Compatible with Hawkvision video door phone systems, enabling users to unlock doors remotely from indoor monitors with just one touch for maximum convenience.