Parking Sensors System with 8 sensors (4 front + 4 rear) from China review

Specifications:
1. Easy installation into any car, truck, or SUV
2. Digital Colored LCD Display
3. 4 Sensor system for enhanced coverage and detection
4. Anti-freeze and rain proof design to work well under extreme weather
5. Advance chipset for optimal detection and distance calculation
Features:
1. Rate voltage:12V
2. Operation voltage:10.5-16v
3. Rated current:40-300mA
4. Detecting distance:0.3-2.5m
5. Ultrasonic Frequency:40KHZ
6. Working temperature:-40--80 degree
7. Display working temperature:0~+60 degree
8. Sensor line 2.5 meters ,display to box is 5 meters long
Package Include:
1 x LCD display monitor
1 x contorl box
8 x parking sensor
1 x power cable
1 x 22mm drill
1 x manual

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How does front sensor activate?