The horizontal detection angle is 110 degree while vertical detection angle is 15No 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 onThis PIR sensor doorbell chime alarm works independently and can not work / alarm and accessory9-15V power adapter-powed(Product without power adapter and need)Working Ding , hello welcome in human voice,with flashing blue lightUsageSwitch mode button to voice diretly,press volume button to adjust volume according to your need.WorkingPlay the music you select with flashing blue light.UsageSwitch mode button to ,Press music button to select a music you like ,volume button to adjust volume based on your need.WorkingContinous alarm sound for 15 seconds with flashing blue light.UsageSwitch mode button to alarm directly,Volume can not be adjusted in this mode.ColourWhiteMaterialplasticPackage Contents1 * Wireless Door BellOnly 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.