Features: Sensitivity: Our multi-purpose application allows you to connect your smart door detectors to our device so you can receive instant notifications on your smartphone when someone enters or exits your home. Accurate: With our advanced technology you can rest assured that you'll only receive notifications when there's actually a problem. Multiple Device Pairing: Our app allows you to pair multiple devices so you can monitor different entry points simultaneously. Our device is easy to install and requires no special tools or skills. Compact Design: Our device has a reusable and compact design making it easy to blend in with your home or office decor. Customer Service: With customer satisfaction as our first priority we offer a satisfaction service for all of our merchandise. If you have any problems please contact us in time. We will give you replies as soon as possible. Specifications: Material: ABS Size: 25*70mm/12*43mm Notes: Please allow slightly errors due to manual measurement and different monitors. includes: 1*Smart Home Door Window Sensor Set(no battery) "