?Secure your home and investment with this FK-9806B2 Smart Home Magnetic Sensor Alarm! Mini sized and easy to install£¬ it will give off a powerful 110dB alarm to scare off the intruder and alert others. You can also alarm or disarm the sensor according to your specific needs. Moreover£¬ it is built with doorbell function for more convenience. Additionally£¬ this alarm is powered by batteries and will inform you of low battery via the indicator. Don¡¯t hesitate to get one!                                    Features             Mini sized and easy to install<br> Give off a powerful 110dB alarm to scare off the intruder and alert others<br> You can also alarm or disarm the sensor according to your specific needs<br> Built with doorbell function for more convenience<br> Powered by batteries£¬ built with low battery indicator<br> Low power consumption£¬ long standby time<br> Come with two sensors and two remote controllers   <br>                                                            Specifications             Voltage     2 x 3V AAA Batteries    <br> Stand-by Volume     100¦ÌA    <br> Alarm Volume     30mA    <br> Frequency     433MHZ    <br> Alarm Response Time     200ms    <br> Stand-by Time     8-12 Months       <br> Voltage     1 x 12V 27A Battery    <br> Stand-by Volume     1¦ÌA    <br> Working Volume     15MA    <br> Stand-by Time     8-24 Months    <br> Remote Control Distance     20m    <br> Working Environment Temperature     -10 ~ 60¡ãC    <br> Working Environment Humidity                             Package Includes            2 x Magnetic Sensor (Batteries Not Included)<br>2 x Magnetic Stick<br>2 x Remote Control<br>1 x User Manual<br>