Features:Light control Infrared induction Infrared sensor to welcome your guests with beautiful song automatically.There are 2 modes， you can choose one by the switch at the right side.To be installed onto wall or ceiling with the given mount bracket or tools. Mount bracket can be adjusted 120 degrees directions.Used widely in home， hotel， restaurant， office building， factory or other places.Fitted with three 1.5V batteries on the 7th， the guests hung on the door edge device will switch out to like the voice file access when there are guests， the guests before the issue to automatically select the voice Light control range of 3- 7 meters， it is recommended that adequate use of light， Infrared control range of 8 meters， when the voice weak， please replace the battery in time This is Electronic Sensor Detector Welcome Chime Speak. You can put it to any places of your room. This product is excellent for being used at home， office， shop or any places need to welcome the guests or the customers. Built-in anti-interference system， avoid false ringing and miscommunication among different users. NOTE:a.Import duties，taxes and charges are not included in the item price or shipping charges.These charges are the buyer's responsibility.b.Please check with your country's customs office to determine what these additional costs will be prior to bidding/buying. Ring Mode 2 Types Powered By:3 x AAA Batteries (Not Included);DC 9V (5.5 x 2.1mm Power Cable， Not Included)Sensing Distance 3 Meters Range (Normal Light Required) Specification:Color: White & GreenPacking content:1 x Electronic Sensor Detector Welcome Chime Speak1 x Installation Accessories