Wireless ceiling mounted security alarm system. Hallway, living room installed burglar alarms, intrusion detection, 433.92MHz wireless home alarm system, 400m emittance alarm detector, intrusion sensor, burglarproof. Features: 1. Automatic temperature compensation. 2. Anti-white light interference. 3. Anti-EMI. 4. Pet immunity. 5. Low power test and report. 6. Two levels of PIR sensitivity optional. 7. Easy installation; elegant shape. Specifications: Input Voltage: ER14250H 3.6V lithium battery. Standby Current: 45uA. Frequency: 433.92MHz. Transmitted Power: >40mW. Wireless Emit Distance: 400m (in open area). Working Temperature: -10C 50C. Sensor type: dual pyroelectric IR sensor. Installation Height: 3~4m. Detective Distance: diameter 6~8m. Detecting Angle: 360°. Packaging Details. Unit Type: lot (2 pieces/lot). Package Weight: 0.36kg (0.794lb.). Package Size: 14cm x 14cm x 9cm (5.51in x 5.51in x 3.54in).