About this item 

• How This Door Open Sensor Alarm Works: Door sensors are devices that let you know when someone has opened a door. When door or window is opened, the Sensors will be triggered to send signal to Receiver, then Receiver will sound to alert you. It can be used for home security, business/home entrance and so on. 

• Door Chime with Long Battery Life: 1 Receiver with 1 door sensor. This door sensor chime designed with ultra-low power consumption for longer battery life. Tested by the professional equipment, this door sensor chime can be used up to 80,000 times, which fully meets the needs of household or commercial use. You need a durable door chime, Not a one month door chime. 

• Wide Range of Action: This door open chime entry alert has 500ft/150m operating range in open area, enough for to cover every window and door in your house or store. Suitable for small and medium-sized homes, as well as shops and apartments. 

• Adjustable Volume Level and Ringtones: This door chime offers 20 different ringtones and 5 levels of adjustable volume (0dB to 110dB). You can set different ringtones for different sensors so that you can quickly find which door has been opened. Flashing indicator light that work together with the sound so you can notice it quickly. 

• Door Chimes When Door Opens: Wireless door chime is perfect for stores and business operations. You can receive the signal at the counter when the customer entry. Besides, this entry alert chime can be a good reminder for you if your toddler or the elderly with dementia trying to get out of the house. 

• Customer Service: This door sensor is easy to use and install, just plug the doorbell receiver into any standard outlet, tear the double- sided adhesive tape of door sensor and stick them to the door or window is fine. Any problems about door open chime, feel free to contact us. We will solve it, your satisfaction is our top priority.