Set Door Sensors to Detect Open Door

1/3/6/8pcs/lots New KERUI open reminder Sensor 433mhz While Wireless Home Alarm Window Door Sensor to Detect Open Door

This Door sensor can’t work alone, It needs to work with the alarm system. Like the below one, you can click the picture:

• Item Type: Home Security
• Material: Plastic
• Size: 75 x 14 x 23 mm / 16 x 11 x 52 mm
• Frequency: 433 MHz
• Operating Power: 23A 12V
• Quantity: 3 pcs
• Features: Home, Protection, Home Security, Security Alarm, Sensor, Detector, Door Open Sensor