Capacitive microphone sensor: high- sensor with sensitivity and accuracyLED-backlit -screen display: high-intensity backlit screen, easy to deal with harsh environments such as strong light/night.windshield design: more sound collection, Filter the effect of wind on soundMulti-collar application: factory/workshop/school/residential/office/ road and other occasions.Material: plasticcolour: blackPackage Contents:1 x Detector (without battery 3X AAA battery)Only the above package content, other products are not included.Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.