Features： 1、Accident Prevention: Long distance driving increases the risk of accidents due to driver fatigue. This device can detect and alert drivers to signs of fatigue, reducing the probability of accidents. 2、Multiple Warning Methods: The device can alert drivers to tiredness through various means such as sound and vibration, ensuring prompt reactions from drivers. 3、Reminds Drivers to Stay Safe: The device can accurately detect the fatigue level of drivers and issue timely warning prompts, reminding drivers to stay safe. 4、Wide Applicability: This device is suitable for various vehicles, including cars, buses, and trucks. Whether it is for personal driving or commercial transportation. 5、Easy to Use: This fatigue driving warning device is user friendly and can be easily installed and operated in any vehicle, making it accessible to all drivers. Specification： Item Type:?Safe?Driving?Alert Material: ABS Car Charger Input: DC12V-40V Car Charger Output: 5V 2.5A Minimum Working Voltage and Current: 4.75V, 240mA Maximum Working Voltage and Current: 5.25V, 500mA Working Voltage, Current: 5V, 320mA Function: Real Time Fatigue Driving Warning And Alarm Warning Time: 1-2 Seconds After Closing Eyes, Viewing Angle 60 Degrees Detection Distance: Approx. 45-65cm / 17.72-25.59in (±5cm / 2.0in) Applicable: Universal for Automobile Package List： 1 x Safe?Driving?Alert Set(4pcs) 1 x Manual