Baby Door Alarm Kit: This kit includes 1 hub station, 3 vibration sensors. Alerts you when your baby gets up at night and sneaks out of the nursery. Provides peace of mind for parents by ensuring their baby is safe. Light droplet detection: The vibration sensor can detect light droplet movement. Simply place it angled at the bottom of your door without installation and receive an alert when the door opens. If the vibration sensor triggers the alarm, the hub station will activate the alarm sound and flashing light upon first use. 14 ring signals, different sensors have different ring signals. 3 volume levels and silent mode. The female voice guides you through the features. Color: Green Size: 6*5.7cm (for the clasp)/4.7*5.2cm (for the sensor) Packing List: 1 set of baby door alarm kit Note Manual measurement may allow for slight errors. Please ensure you have no objections before placing an order. Color may vary slightly depending on different screens. Kindly understand this. Note Hello, please pay attention to your delivery address when purchasing products. If your receiving information (such as name, street address, house number, doorbell/email without name, etc.) is incorrect, the order may not be delivered properly.