This is a dual channel transmitters that are activated only after having entered a Suitable combination.<br>The units are designed for installation in indoor or outdoor locations that ensures the utmost security because the transmitted code is changed at each transmission session.<br>The estimated transmission range is 200 m in open space and 35m indoors .<br>The units are designed to battery life equivalent to an estimated 2 years of oper- considering 10 transmissions/day.<br>Power:6Volt DC<br>2PCS CR2032 Li battery<br>Battery life:2 years(4 times operation every day)<br>Frequency:433.92MHz+/-75KHz<br>Transmitter power:1Mw<br>Data format:standard<br>Work temp:-20~+55 centidegree<br>Password number:0-8<br>Water proof level:IP54<br>Material:Plastic + Metal<br>colour:Black + gray<br>Package Contents:<br>1 x Keypad<br>1 x English Manual<br>Only the above package content, other products are not included.<br>Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.