What's in the box:

Standalone Photoelectric Smoke Alarm Fire Smoke Detector Sensor Home Security System for Home Kitchen 9V (Black Red)

Features:
Independent installation on ceilings and walls, with mounting bracket, which is easy to install and do not need to debug.
With specially designed cover, can protect it from dust.
Built-in dedicated IC: with stable performance and high sensitivity.
Can monitor air and detect smoke with optical principles. When it reaches the maximum amount that the chamber can bear, it will alert.
LED light flash indicator.
Low battery indication.
With a test button: can take analog alarm tests of the smoke alarm.
Can warn and alert people to stay far away from dangerous field when it detects smoke.
Suitable for use in house, shop, school, office building, storage areas, etc.

Specifications:
Color: white
Material: ABS
Power supply: 9V battery (not included)
Standby current: 10A
Alarm current: 15mA
Operating voltage: DC9V
Alarm indication: red LED flash & sound
Loudness: 120dB
Operating temperature: -10 degrees centigrade to +50 degrees centigrade
Operating humidity: 95%RH (402 degrees centigrade)
Detecting area: 60 sqm
Item size: 3.4 * 10.7cm/ 1.3 * 4.2in (diameter)
Item weight: 100g/ 3.5oz
Package size: 10.5 * 10.5 * 4cm/ 4.1 * 4.1 * 1.5in
Package weight: 101g/ 3.56oz

Packing list:
1 * Smoke alarm
1 * Bag of screws
1 * User manual