Characteristics: The detector is very sensitive, does not report false alarms. It can connect or use batteries. Fully automatic infrared detection, with strong sensitivity, can not affect the light. Thanks to this, the do doorbell can be felt during the day and night. The rotating handle makes it easy to adjust the monitoring angle. You can place it anywhere or mount it on the wall. The built-in host speaker has a welcome volume of 85±5 decibels, which is the loudest in the welcome family. 16 infrared music welcomes (available day and night) has two levels. The first level is welcome, and the second is dingdong-16 musical alarm sound (adjustable). Powered by 3-AA batteries, it is energy-efficient and durable to use. (This device does not include batteries.) Remote detection can reach do 0-6 meters, and the available temperature is 0-25 degrees. . ALARM INPUT INDICATOR MOTION SENSOR BELL . ALARM INPUT INDICATOR MOTION SENSOR BELL Specification: Color: White Material: ABS plastic Sound: Second level: Dingdong +16 music and alarm sound (adjustable) Battery: 3 AA batteries (not included) Remote detection: 0-6 meters Applicable temperature: 0-25℃ Method of installation and use: 1. Press the battery cover on the back of the doorbell towards the arrow, install 3-AA batteries (alkaline batteries are recommended) and cover the battery cover. 2. Doorbell switch do door to voice or alarm level. 3. When the guest enters, the welcome bell will sound the way you chose before. List of packages: 1 x Welcome Sensor 2 x Base . ALARM INPUT INDICATOR MOTION SENSOR BELL . ALARM INPUT INDICATOR MOTION SENSOR BELL 1. Every time the battery is installed, the product must be self-tested by about 15-20S, and then enter the normal working state. 2. Sensitivity and volume are set to standard, not adjustable. 3. If the product has an automatic sound or abnormality, check the battery power supply or the installation location is correct. 4. Avoid directing do of the illuminating light do sunlight and reflection at direct exposure, if the ambient temperature is too high (above 30 degrees), the device will appear from a distance do close, which is normal. 5. When the sound of the doorbell is weak, the battery should be replaced. The do doorbell should be installed in a position where the direct airflow changes significantly (such as air outlet, exhaust fan, electric furnace, etc. ), not installed in the sun or rain. . ALARM INPUT INDICATOR MOTION SENSOR BELL . ALARM INPUT INDICATOR MOTION SENSOR BELL