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, favorable home alarm system. Voice/alarm/music mode for you to select with mode button according to the need, “Dingdong, hello, welcome ”in voice mode; about 15 seconds continuous alarm sound in alarm mode; play the music you select in music mode. 4 levels volume adjustable with volume button; total 32 kinds of music selectable with music button. It is more convenient to use the battery to power, without the limit of installation place while working time will be more lasting if using the power adapter. The horizontal detection angle of the chime motion detector is 110° while the 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 the battery, and adjust the angle to avoid false alarm, not suitable for outdoor because of lack of waterproof function.