This is a set of 10 unused items. 【Product Overview】 This smoke detector, model number SS-2LRA-10HCC, is provided by the NS brand. It features wireless interlinking, allowing all installed units to work together. 【Safety】 It emits an alarm sound when smoke is detected, enabling early fire detection. This is an essential item for protecting the safety of homes and offices. 【Ease of Installation】 It is easy to install, requiring no special tools. Anyone can handle it with ease. - Model Number: SS-2LRA-10HCC - Function: Smoke Detector - Brand: NS - Features: Wireless Interlinking - Installation: Easy Installation Thank you for viewing.