The New Wireless Door/Window Entry Alarm Battery Operated YL-333 is a white wireless door/window entry alarm designed to provide security for your home. It is compatible with both windows and doors, offering convenience and flexibility for your security needs. The YL-333 model is easy to install and operate, providing peace of mind against potential intrusions. Manufactured in China, this alarm is powered by batteries, ensuring continuous protection even during power outages. Set of 12.