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6 Realistic Dog Barks sounds : Lots of choices in alarm soundsThe motion detector very sensitivedog bark motion detector more like caring a kid’s dog. Wide range of applications :The sensors can be mounted to doorswindowswalls fence posts trees or any other surface which is great for homes offices garages yard and shopping malls for full coverage of your property. With waterproof building Its suitable for indoor/outdoor use; double-sided sticker or screw can be used. Ideal for front doors hallway window frames driveways walking paths and anywhere in your home you want to be alerted to motion detector. /br Pir Wireless Human Body Walking Motion Activated Sensor Doorbell Door Security Alarm Alert System With Dog Barking Sound /br /br Q: What is the Correct usage environment for normal working. /br /br A:Please do not install the item in the rain direct sunlight exposure for a long time strong magnetic interference heavy cold and hot air place.e.g air-conditioning port. /br /br A:please check receiver to make sure the working mode in unlocked condition Lock will be no activated response. /br /br Q:Can Pir sensor detect the motion through a wooden door or window glass or any other obstacle. /br /br A:Nopls install sensor to detect work without any obstacle /br /br Q:Sensor transmitter does not recognize activity every time. /br /br A:Sensor working only once in 7 seconds. /br /br Q:can it use by plug into wall Recommend receiver use AC powerSensor use battery power AAA1.5X3PCSnot contain. /br /br Q: Can this item waterproof weather-proof or other espeical funtions /br /br A:Reveiver waterproof IP43IP44. Sensor waterproof IP43.