Features: High technology: Features electrochemical sensing technology and photoelectric smoke sensor optimized to detect larger smoke particles produced by smoldering fires; helps minimize the number of false alarms More than 80 decibel: A loud 80 decibel alarm sounds and LED quickly flash when smoke levels begin to rise Mini design: Features a sleek, low profile design to blend more fully into the wall and out of sights Material: ABS flame retardant shell, effective fire protection, long service life Mute: When there is no fire hazard, you can press the self-test/mute button to temporarily reduce the sensitivity and stop the alarm Notice: 1. Due to the different monitor and light effect, the actual color maybe a slight different from the picture color. 2. Please allow 1-3cm differs due to manual measurement. 3. Actual item may have logo, if you want to know, please contact us, please do not bid if you mind Specification: Size: 60*49.2mm Color: white and gray Applicable places: home, hotels, restaurants, hotels, etc. Package List: 1 x Smoke Detector AlarmBuilt-In Battery