This wireless door window contact transmitter from QOLSYS is a reliable and efficient solution for your alarm system needs. The QS1135-840 model is designed to work seamlessly with iQ2, iQ2+, and iQ4 systems, ensuring maximum compatibility and performance.

With its durable construction and high-quality materials, this contact transmitter is built to last and provide reliable signals for years to come. Whether you're looking to upgrade your alarm system or seeking a replacement part, the QOLSYS QS1135-840 wireless door window contact transmitter is a great choice.

Used but in great working condition. All sales are final. I have about 20 of these. No returns accepted.