This product is a door sensor, which is made of durable plastic material, with good texture, sturdy and practical. Easy to install and use, it can be easily applied to your door, a very practical accessory that will meet your needs well. Features -Color:White -Material:Plastic -Size:7.00X2.50X2.00cm/2.75X0.98X0.79in -Size:4.40X1.50X1.00cm/1.73X0.59X0.39in -Input voltage: DC3V LR03 -Static current: <=35uA -Alarm current: <=135mA -Low voltage: <=2.4V - : 802.11 /n -Magnetic control distance: <=20mm -Light range: 0~10000Lux -Operating temperature: - centigrade~+50 degree centigrade -Working humidity: Max 95%RH -This innovative alarm designed to provide independent and reliable security for your home or office. -With its advanced contact sensor technology, it can detect any unauthorized entry through doors or and trigger a loud and attention-grabbing alarm. -Unlike other devices, this alarm is completely unaffected by from other electronic devices, ensuring that you receive timely and accurate alerts in case of any security . -Its versatile design allows it to be used as a for opening and closing doors, making it a convenient and practical addition to any home or office. -With its multiple alarm sounds, you can choose the one that best suits your needs and preferences. protect your property and loved ones with this powerful and dependable door and window alarm system. Package list: 3 x set of sensor