1. Wireless Ceiling-Mounted Smart Digital Infrared Detector, 360-Degree All-Round Detection, Small And Beautiful, Easy To Set Up , Convenient To Use 2. Digital Circuit, Using Microprocessor; Bidirectional Digital Temperature Compensation, Super Anti-False Alarm Capability; 3. Made With Smt Process, Resistant To Rfi And Emi Interference 4. Adjustable Pulse Count And Adjustable Detection Sensitivity 5. Adjustable Detection Distance, Anti-Tamper Function, Low Battery Alarm Function Wireless Transmission Distance:200 Meters In Open Space Transmission Frequency:433Mhz Encoding :1527 Million Encoding/2264 Fixed Encoding All-Round 360 Detection, Detection Distance: 10m Note:Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Colour:As Shown Material:ABS Package Contents: 1 * Wireless Ceiling Infrared Detection Alarm 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.