KERUI Wireless PIR Motion Sensor Door Bell Shop Visitor Alert Chime Alarm Burglar Brief Introduction: Combined with motion detection, 90db alert and flashing blue light, 2-6M detection range in open area, this standalone, all-in-one chime alarm plays an important role in informing you of intruder or visitor. The pir motion chime sensor alarm is suitable for shop, office, home, business etc., to alert you when it detects movement, user-friendly operation and easy installation, favourable home alarm system. Main Function: Voice/alarm/music mode for you to select with mode button according to the need, Dingdong, hello, welomein voice mode; about 15 seconds continous alarm sound in alarm mode; play the music you select in music mode. 4 levels volume adjustable with volume button; total 32 musics selectable with music button. Supply Mode: There are two ways to power this doorbell chime: 9-15V power adapter and 3 AAA battery (Please note that power adapter and battery are not included in the package, you need to buy them by yourself). It is more convenient to use battery to power, without the limit of installation place while working time will be more lasting if using power adapter. Easy Installation: The horizontal detection angle of the chime motion detector is 110 while vertical detection angle 15. Come with 2 screws and double-face tape, you can mount it as you like. It is used directly after receiving, put in battery and adjust angle to avoid false alarm, not suitable for outdoor because of lack of waterproof function. Attention & Warranty: No matter which mode the pir shop entry 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. 12-month warranty, technical support and friendly responsive customer service within 24 hours. Any questions, welcome to contact us by amazon email.