The horizontal detection angle is 110 degree while vertical detection angle is 15 No matter which mode the motion chime is ,when it plays voice/ alarm/ music, you can not forcibly switch off it or cut off power unless they finishes completely and blue light stops flashing, or all the settings will be reset. This product is suitable for a of occasions, shopping malls, shops, supermarkets, home doors, offices and so on This PIR sensor doorbell chime alarm works independently and can not work / alarm and accessory 9-15V power adapter-powed(Product without power adapter and need) Working Ding , hello welcome in human voice,with flashing blue light Usage:Switch mode button to voice diretly,press volume button to adjust volume according to your need. Working:Play the music you select with flashing blue light. Usage:Switch mode button to ,Press music button to select a music you like ,volume button to adjust volume based on your need. Working:Continous alarm sound for 15 seconds with flashing blue light. Usage:Switch mode button to alarm directly,Volume can not be adjusted in this mode. Colour:White Material:plastic Package Contents: 1 * Wireless Door Bell 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.