Humanized design, simple installation, no need for professional installation, ready to use,Infrared sensing, available day and night, regardless of day or night There are multiple voices to choose from in the normal mode, including the welcoming voices of multiple countries.Recording mode: You can record the sound you need, or by voice. The volume can be adjusted in three levels, and the sound can be adjusted according to the location to suit your needs. High sensitivity, sensing distance 2-7 meters. The sensing range can be adjusted freely Bracket activity range: 360° free rotation without dead angle Function description: 1. Normal mode: Short the song selection button to play song. There are 20 sounds to choose from 2. Recording mode: Long the recording button, play the "BI" sound to start recording, the recording time is , when or half, release the recording button, indicating that the recording is over, and play two BIBI sounds. 3. Short the recording button, "Recording Mode" be broadcasted, and the recording mode be entered. In recording mode, time you use the infrared sensor, the recorded sound be broadcasted, and the previous recording be overwritten when you record again. 4. Power on/off button/volume button: three gears (high volume, medium volume, low volume), the volume adjustment has the corresponding volume level prompt. Long the button for 3 seconds for the power on/off button (with a beep), and the power is on by default after powering on. Colour:Black Material:Plastic Package Contents: 1x smart welcome doorbell Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.