If the system detects an obstacle that is likely to cause a crash, it warns the driver via an alarm, a flashing light, and then a tactile or "haptic" warning which tightens the driver's seatbelt.

如果该系统监测到前面有可能引发碰撞的障碍物，它就会通过警报器、闪烁灯以及可感触的(tactile or haptic)的警告——收紧驾驶员的安全带——向驾驶员发出警告。

youdao

He found an electronic pill dispenser box with an auditory alarm as well as a flashing light alarm.

FORBES: Wake-Up Call: Mom's Trip To The Emergency Room

The proposed alarm could take any number of forms, from a buzzer, to a flashing light or bed shaking motor.

ENGADGET: Sony patent application puts electrodes in a pillow, eases you out of slumber