The product is a 4-pack of Chtoocy wireless intercoms designed for home use, with a long range of 1 mile for reliable communication. Each intercom is made with black push button control method and powered by a lithium-ion battery, and each unit weighs 1.23 pounds, making them easy to install and use throughout the home. With rechargeable batteries included, these wireless intercoms provide a convenient and secure way to communicate within your household.
eBay