Bullet_point: ['2 in 1 Alert & Alarm Modes. Alarm Mode has built-in piercing 95-dB siren. Be notified of your surroundings!', 'Easy to install & Set-up. Magnetic type contact sensor that notifies you when the door or window is opens.', 'Expandable system, HA-434RL receiver can work with up to 16 sensors in 4 zones.', 'One HA-434RL Household Alert Receiver (AC/DC adapter included) & One WD-434TL Window Door Sensor ( Battery Included)', 'Supervised sensor monitors the sensors and their battery condition automatically.']

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