New sleek design.</br>Two reed switches.</br>Transmits supervisory?? tamper and low battery messages.</br>Up to 1 mile wireless outdoor range.</br></br>Product Description</br></br>The 5815 is the ideal solution for installations where small size and aesthetics are important. It provides a reliable?? convenient?? and cost-effective solution for door and window protection. With a demonstrated outdoor range of over a mile?? the 5800 Series has the best performance of any transmitters available today. Features: -New sleek design -Two reed switches -Transmits supervisory?? tamper and low battery messages -Battery: 3V Lithium -Dimensions: 3in H x 1-1/2in W x 7/8in D</br><br/>http://www.amazon.com/gp/product/B0017KGFCO