Features: Can be used independently or with a 433MHz frequency host. Novel shape design, stable performance, safe and reliable. Using low-power microprocessor and software algorithms, the detection system has self-test function, low voltage detection and reminder. Alarm code EV1527/PT2262, other can be customized, alarm frequency 315/433MHz optional. Powerful against RFI/EMI interference, using advanced SMT technology. Suitable for the environment: suitable for residential, cafes, dance halls, hotels, restaurants, apartments, restaurants and so on. When the height of the detector is higher than 2.3-6 meters from the ground, the warning range is 40㎡. When the height of the detector is higher than 6-12 meters from the ground, the warning range is 60㎡. Specifications: Condition: Brand New Material: ABS Color: White Power input: 3.6V 1/2AA lithium battery Current consumption: <10uA (standby), <20mA (alarm) Installation method: ceiling Alarm threshold: 5-25% obs/m System self-test: customized by customer (H) Alarm volume: greater than 85dB (3m in front) Alarm time: smoke continuous alarm Low voltage start: 2.8V Wireless transmission distance: more than 300 meters (open space) Wireless transmission frequency: 315/433MHz optional Alarm output: Ev1527 / PT2262 and other formats Work instructions: 60s green LED flashes once Protective area: >40m2 Anti-RFI/EMI: 1-500MHz/10V/m Working temperature: -10°C / +55°C Ambient humidity (RH): 95% Volume: 101*44mm/4*1.7in Weight: Approx.147g/5.2oz Package List: 1 * Wireless Smoke Alarm 1 * Pack of Mounting Screws 1 * Manual 1 * 1/2AA Battery 1、Can be used independently or with a 433MHz frequency host. 2、Using low-power microprocessor and software algorithms, the detection system has self-test function, low voltage detection and reminder. 3、Alarm code EV1527/PT2262, other can be customized, alarm frequency 315/433MHz optional. 4、Suitable for the environment: suitable for residential, cafes, dance halls, hotels, restaurants, apartments, restaurants and so on. 5、When the height of the detector is higher than 2.3-6 meters from the ground, the warning range is 40㎡. When the height of the detector is higher than 6-12 meters from the ground, the warning range is 60㎡.