JNHCD 3 Pack smoke and carbon monoxide detectors powered by batteries with digital display smoke and carbon dioxide dual alarm sensors easy to install black (GS908)

*SPECIFICATION* *Power supply: DC 4.5V (3*1.5V AA Batteries) * Standby current:≤98uA *Alarm current: ≤75mA *Alarm sound: ≥85dB (1m) *Sensor type: Photoelectric sensor & Electrochemical CO senso *Low battery warning: *Temperature range: 0°C~49°C (32°F~120°F) *Humidity: ≤95%RH (No icing or condensation) *Dimension:Φ115(D) x 38(H)mm *Alarm sensitivity. CO alarm sensitivity & time: 70ppm alarms within 60-180minutes; 150ppm alarms within 10- 50minutes; 400ppm alarms within 4-15minutes; 700ppm alarms within 2-6minutes. *Executive criteria: UL217; BS5446