Features:1. Excellent stability2. Wireless Interconnection Alarm（Optional）3. Sound & Flash Alarm & LED indicating Alarm4. Infrared Photoelectronic Sensor5. SMT Manufacture technology6. Dust-proof，Mothproof and Anti White light interference7. Designed for the fastest possible installation8. Suitable for detect the smoke in house， shop， hotel， restaurant， office building， school， bank， library， computer house and storehouse etc Specifications:1. Power Supply: 9V battery （6F22 carbon battery，DC Type， Not included）2. Static current: <10uA3. Sensor level:2.06%/ft±1.34. Alarm Sound:85dB/3m5. RF:315MHz/433MHz(Wireless Type)6. Transmitting Distance：200 meters（Open）7. Relative Humidity:≤95％ RH8. Temperature: -10~50°C9. Execution standard：GB4715-2005，En14604，UI21710. Size: Approx 105*60mm11. Material: ABS plastic12. Color: WhitePackage Included:1 x Smoke Detector1 x English User Manual4 x Screws