Features - Manual test， auto-reset - Photoelectric sensor - Sound & flash alarm - Single sided fiberglass PCB- High stability to the environment - High density SMT design ParameterMaterial: ABS PlasticOutput pulse voltage: 2000 kvBattery: included Color: whitePower supply: 9 Volt batteryStatic current: ≤10uA Alarm current: ≤15mA Working temperature: -10 to +50 degree Celsius Humidity: ≤95%RH Alarm mode: sound & flash Sensitivity: 85dB at 10 feetMonitoring area: 20 square meter Size: 107 x 35 mm Package included5 x Smoke Detector （battery is not included）5 x English Manual 10 x Screws In color box