Simple, fast wireless installation: infrared sensor detects motion and sends a signal to the receiver. Choose from 38 ringtones with bright LED light. The sensor can be mounted on the wall. Wireless plug-in receiver: the portable wireless plug-in receiver plugs into any standard socket. The sensor uses 3 AAA batteries (not included). The delay of detection between motion sensor alerts is configurable from 15 seconds to 30 seconds. Simply place the sensor on the driveway to your driveway and the receiver in your home. 1Range up to 100 meters between receiver and transmitter, so you can place it at adequate distance from the receiver to warn you before the arrival and departure of family members, unwanted guests or lawyers or anyone who visits your home or business Ideal for front doors, window frames, driveways, walkways and anywhere in your home where you want to draw attention to movements. Also great for alerting business owners who work in the background or out of sight to customers entering their business. Note: includes 2 plug-in receivers and 1 motion sensor that requires 3 x AAA batteries (not included). Receiver size: 3.14 L x 2.99 W x 1.29 H (80 x 76 x 33mm) Sensor size: 3.14 L x 2.32 W x 1.77 H (80 x 59 x 45mm) NOTE: 1. The size of the product is measured manually, and there will be an error of 2-3mm due to factors such as different measurement tools and measurement methods. 2. This product is all taken in kind, but due to differences in photography, lighting, color deviation, and personal understanding of color. As a result, there may be some color difference between the actual product and the photo, and the color is subject to the actual product. 3. Please take good care of our products