Wireless Motion Sensor Alarm-RISWOND motion detector uses the latest digital dual-core fuzzy logic infrared control processing technology and intelligent analyalgorithms. This house alarms security system can be used as home/driveway/shed/garage/intrude/burglar/perimeter/caravan/van alarm, etc. . Professional Motion Detector-This home security system has 4 "TWO": TWO modes(doorbell/alarm) TWO volume levels(low or high) TWO alarm signals(sound & red light). TWO power supply methods: 3*AAA batteries or USB cable(Included). It is these 4 "TWO" that makes our motion sensor stand out in the market. . Enhance Your Home Security-Small equipment, powerful functions Approximately 16-26ft infrared detection range, max 125dB siren. This durable motion sensor based alarm system will well protect your shed, Room, Boat, Garages, etc. Choosing RISWOND security alarm, provide security for your family and property. . Easy to Install & Set up-This indoor wireless alarm system is fully-expandable, you can use one remote to control several pir sensors. We intimately provide you with two screws and a film sticker. You can use a USB cable or install 3 AAA batteries(incl.) to power it. . Excellent Worry-Free Warranty-RISWOND motion alarm can provide security for your family and property. You will enjoy our professional return and exchange warranty from the day you receive the home security alarm. RISWOND guards your family .