Wireless Doorbell Detector for Doors and Windows, 39 Ringtones, 2 Alarm Bells 4 Pairs of Door Detectors, Alarm System for Home Security, Black

• 39 Ringtones - The receiver has 39 melodies and 5 volume levels adjustable from 0 to 110 dB; the door alarm sensor has memory function, and the original setting will be retained after a power outage.
• Easy Installation - Just plug the alarm receiver into a power outlet and open the double-sided adhesive attached to the black mini door detector and stick it on the door or window. WARNING Please do not install it on metal door, which will affect the signal of the door detector, and make sure that the distance between two door detectors is less than 0.4 inch.
• Expandable System - The door chime detector kit can be extended up to 20 sensors and 20 receivers to fully cover your property and safety. Ideal as a door alarm for home security, but also as a door chime for shops when entering.
• 80m/260ft range - Wireless doorbell Wide range The wireless receiver can carry up to 250m. When someone opens the door or window or the animal comes home, you will be alerted by a ringtone.
• Door Chime Kit - This wireless door sensor emits a volume of 110dB when the door or window is suddenly opened. It is a good helper for children, home, garage, school and safety.

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