About this item

• Low-voltage reminder function - When wireless door sensor is in low voltage, it will flash light all the time to remind user change the batteries.
• Built-in omnidirectional antenna - The door/windows alarm with built-in antenna to strengthen the signal, make it more sensitive
• Can't work standalone - The door detector work with home alarm system,use as alarm accessories.
• Magnetic sensor switch detects entry protecting your home or office. Superior circuit design, High-performance and low power consumption.
• Easy to install--just peel and stick
• 1. The dog chased the cat.
• 2. The cat was chased by the dog.
• 3. The sun sets in the west.
• 4. The west is where the sun sets.
• 5. She drank the hot tea.
• 6. The hot tea was drunk by her.