Smart Doorbell 120° Detection Angle Wireless Doorbell For Yard Feature:1. Multi-function Volume Setting: Using high-fidelity speakers, low power consumption, built-in 38 high-quality sound effects. The volume can be adjusted intelligently. Four gears are optional. You don't have to worry about not being able to hear or hear clearly under special circumstances. (Note: It is recommended to adjust the volume to 1-2 for daily use.)2. Mute function: One click mute without interruption is the gospel of the elderly and children. You can select a mute mode. Only the light flashes without ringing to avoid waking up a sleeping child or the elderly.3. Strong Wireless Signal: It has strong penetration. The 433mhz FM signal scheme has strong penetration. The signal transmission is more than 200m, meeting your different life needs.4. 120° Sensing Angle: The smart doorbell adopts imported infrared probe, 360° universal rotation, 120° sensing area and 3 middot sensing distance; 7m.5. Security alarm: strictly protect the safety of people and money. When no one is home day or night, someone opens the door and the bell sounds the anti-theft alarm to protect the safety of your family and property. Specification:Item Type: Smart Wireless Doorbell DetectorMaterial: ABSgage: Approx. 224g / 7.9ozTransmission Distance: gt; 200m (Open Ground)Sensing Angle: 120°Sensing Distance: 3-7m/118.1-275.6inRF Frequency: 433MHzDoorbells: 38One for Two: The alarm is installed indoors, and two sensors can be installed at the door or garage for monitoringAlarm Voltage: 110-240V Single Sensor Head Power Supply: 3 x AAA Batteries (Excluding Off)LED Color: BluePackage List:1 x Receiver1 x Sensor Head2 x Shield2 x Fixed Heads2 x Fixed Sockets4 x Screws4 x Pipes expandable1 x user manual Usage:1. Secure the sensor with screws and expansion tubes.2. Install the alarm in the living room or room. (in the ear)