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Manufacturer Specifications ?Main Function: Anti Sleep Alarm ?Alarm mode: Vibration ?Dimensions: 75 x 22 x 15mm ?Angle of Protection: 15~ 30 ?Battery: Replaceable button cell battery ?Life Time: 30,000 nods Product Notes ?There is no vibration when the driver keeps normal driving status with eyes looking forward ?Ergonomic Design and comfortable feeling rubber ?Lightweight and fits comfortably behind either ear ?Easy way to stay awake - no need for caffeine or pharmaceuticals