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General: Quantity: 1 piece Material: ABS Form Color: Black Specification: Function: The driver is wearing on an ear, while drowsiness, head tilted forward, the device will issue a warning, causing the driver to wake up, thus avoiding the occurrence of traffic accidents; Great for safety driving; It also can be used to remind the student to correct their sitting posture to prevent myopia , LED torch LED Quantity 1 Power Supply: 3 AG13 button cells included Dimensions Weight: Dimensions: 2.68 in 2.01 in 0.59 in 6.8 cm 5.1 cm 1.5 cm Weight: 0.67 oz 19 g Packing List: 1 Anti Sleep alarm