Features:  LOUDER ALERT: When the magnetic sensor is disconnected, the KERUI door and window alarm system will issue a loud 120dB warning to prevent theft and unnecessary access, preventing your child from sneaking out.  LONGER CONTROL RANG: This wireless door alarm kit comes with a wireless remote control for arming, disarming, SOS and doorbell options. It makes it easier to remotely control door/window alarms up to 300 feet.  MULTI-FUCNTION ALARM SYSTEM: You can select the doorbell mode to draw attention when people enter, as a commercial doorbell when entering. With the SOS option, seniors can easily get help in an emergency. Good protection.  EXTENSIBLE & LINKANGE ALARM: You expand your home security alarm system with more alerts or remote controls, Infrared detector, door sensor, smoke detector, gas detector, emergency button.  EASY INSTALLATION: This anti-theft door and window alarm is easy to set up. Simply install it with the double-sided tape provided. Take just a few minutes.  BATTERY REMINDER: When the battery is very low, the alarm volume will decrease and the alarm time will be shortened, reminding you to replace the battery . (2 AAA batteries are not included)    Technical Parameters:   Working voltage: 3.0V (powered by 2 AAA batteries are not included);  Standby current: <10uA;  Working current: <80mA;  Receiving frequency: 433MHz;  Alarm time: 60 seconds;  Alarm volume: 120DB;  Alarm output: open the door and alarm after arming, and trigger the detector to alarm after arming;    Package included:   1 x Wireless Door/Windows Sensor Alarm Set