This is our 4 Packs Siterwell 10 Year Battery Smoke Alarm Kitchen Smoke Detector + Battery. Press test button and hold it for more than 3 seconds until LED lights, and release it within 2 seconds, smoke detector will generate a ?beep? indicating that it is successfully activated. Smoke alarm won't work if activation fails.

Features:

• Photoelectric Technology-The smoke alarm uses a photoelectric sensor to ensure that fire smoke can be detected in advance, giving family more time to escape. Besides, the photoelectric sensor is purer than the ion sensor, and avoids the radiation of the ion sensor.
• Fault Signal Alarm-The photoelectric smoke alarm is very easily tested only by pressed the button more than 5 seconds, the low battery will have a signal alarm which will recall you to change a new battery.
• Good Quality-The smoke detector has passed UL certification, its quality is guaranteed. The smoke alarm don't contain any radioactive material and won't cause harm to human's body.
• 10 Years Life Time-The smoke alarm can be 10 years life time and has 10 years life time non-repalced battery. You won't worry about replacing the battery any more. And it can save energy and protect environment.

Specifications:

• Sensor type: Photoelectirc
• Product life: About 10 years
• Safety standards: UL 217
• Best operating ambient temperature:4.4-37.8?(40-100?)
• Loud>85dB(A)alarm signal@3M
• Weight: 1.76 lbs
• Brand: Siterwell

Package includes:

• 1 x Alarm
• 1 x Mounting Bracket
• 2 x Screws
• 2 x Anchor Plugs
• 1 x User Manual