NineLeaf 1 Set (1 Sensor,1 Alarm) Muti-Function Wireless Welcome Warning Greeting Doorbell PIR Motion Detector Sensor Visitor Alarm Chime Door Bell Infrared Security Smart Entry Alert System Kit

Parameters Battery Lifespan:5-7 months (based on 30 times per day) Working Frequency:433.92MHz Working Temperature:10 degree below zero to 60 degree above zero Operating Humidity:below 80 percent Storage Temperature:20 degree below zero to 70 degree above zero Batteries and Power 1.3*AAA alkaline batteries for PIR transmitter, 3*AA for Receiver, please note the negative and positive. 2.Alkaline batteries are recommonded, other types will shorten standby time and lower the alarm volume, Micro USB is alternative for power supply;battery supply will be automatically cut off if AC power, and can be standby power supply if power off. 3.You will hear short "DU" and see LED colorful lights flashing after loading the batteries for receiver, load the batteries, turn on the transmitter, the blue LED indicator will be on for 5 seconds. Low Batteries Indication 1.Infrared curtain LED flashes once every 3 seconds 2.Receiver?if you hear the low battery indication sounds when it is in application, please replace the battery in time, or all functions cannot be realized. 3.LED indicator gets darker or wireless range get shorter