1. Infrared Detectors Should Be Installed Away From , Air Conditioners, Fluorescent Lamps, Electric Heaters, Refrigerators, Ovens, Stoves, Sunlight And Other Places Where High Temperature Changes And Places With High Air Flow Rates. 2. Accessories Can Be Installed According To Different Household Types. Different Accessories Are Installed In Different Places. The Temperature Of The Place Where Accessories Are Installed Is Preferably -10-40. Indoor And Outdoor Accessories Can Be Installed Together To Achieve A Significant Anti-Theft Effect. 3. If Two Detectors Are Installed In The Same Detection Range, Please Adjust The Position To Avoid Interference Between The Detectors And False Alarms. 4. Although The Host Is Powerful, It Must Be Matched With Accessories To Work. A Good Product Must Be Equipped With More Combinations To Form A Powerful Anti-Theft System. Don'T Let Thieves Take Advantage Of It! 5. Wide-Angle Wireless Infrared Detector, Door And Window Alarm, Anti-Theft Alarm Equipment Power Supply:DC 3V (3Pcs 1.5V AAA Batteries Not Included) Standby Current:less than equal 5 OUA Alarm Current:less than equal 9.5mA Detection Range:8M/110 Wireless Transmission Distance:less than equal 80m (Open Area/No Interference) Radio Frequency:433Mhz Conditions Of Use:Temperature -10 - 55 Relative Humidity:less than equal 80% (No Condensation) Note:Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Colour:As Shown Material:ABS+Plastic Package Contents: 1 * Wireless Infrared Detector 1 * Bracket Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.