Connect router signal, no gateway required *Build-in buzzle *Compatible with Tuya , Google Home and Alexa. *Alarm & Chime sound mode optional *Home mode (Arm instantly) & Away mode (Arm with delay) *Settable on-site disarming *Password required to disarm for intruders. *Kidnapper prevention and children protection Low battery indication When the battery voltage is lower than the specified value, after the door&window sensor is triggered, the low battery notification will received after the door&window sensor in active status in app. When door&window sensor enters the semi-sleep state, red light flashes once every 3 seconds. This state reminds you to change the battery, otherwise the door&window sensor not work anymore. Technical Specification Operating Voltage: 2pcs * AAA Battery Standby Current: