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This anti-sleep alarm is not only designed for drivers, but also perfect for people who need to be wakefully while on duty, for example, security guards, machine operators.Features: Driver safety alarm can help prevent accidents caused by driver's sleep when driving. It is especially suitable for long-distance driving or night driving. It is guardian angel for drivers. Easy to use and comfortable to wear for a long time. Specifications: Type: Driver Alarm Alarm mode: Vibrate alert Battery: 3pcs LR41 Product weight: 12g / 0.4oz Package size: 15.9 * 8.7 * 1.5cm / 6.3 * 3.4 * 0.6in Package weight: 22g / 0.8oz Package List: 1 * Driver Alarm